diff --git a/src/resources/apps/index.jsx b/src/resources/apps/index.jsx
index 50fd25d30ea986c3b82de987ceb7541ce96d07ef..b2ac088f56204c37a81b0e4a7f4d9c6eb25bf996 100644
--- a/src/resources/apps/index.jsx
+++ b/src/resources/apps/index.jsx
@@ -1,5 +1,5 @@
 import * as React from "react";
-import {FunctionField, WrapperField, Edit, Toolbar, SaveButton, DeleteWithConfirmButton, ReferenceInput, SelectInput, Link, useCreatePath, useNotify, useRedirect, required, FileInput, FileField, TextInput, List, Datagrid, TextField, TopToolbar, Create, SimpleForm, CreateButton, EditButton, ListButton, useRecordContext} from 'react-admin';
+import {AutocompleteInput, FunctionField, WrapperField, Edit, Toolbar, SaveButton, DeleteWithConfirmButton, ReferenceInput, SelectInput, Link, useCreatePath, useNotify, useRedirect, required, FileInput, FileField, TextInput, List, Datagrid, TextField, TopToolbar, Create, SimpleForm, CreateButton, EditButton, ListButton, useRecordContext} from 'react-admin';
 import DomainIcon from '@mui/icons-material/Domain'
 import IconLink from '@mui/icons-material/Link'
 import PeopleIcon from '@mui/icons-material/People'
@@ -8,21 +8,10 @@ import { useTranslate } from "react-admin";
 import {useNavigate } from 'react-router-dom';
 import Button from '@mui/material/Button';
 import {useParams} from "react-router-dom";
-import { useEffect, useState, useContext } from "react";
-import {useFormContext} from 'react-hook-form';
-import { ClassSelectContext, ClassSelectProvider } from "../../utils/contexts";
-import { IconButton, Grid } from '@mui/material';
-import SearchIcon from '@mui/icons-material/Search';
-import CheckIcon from '@mui/icons-material/Check';
-import {Box, Drawer} from '@mui/material';
 import {roleChoices, RenderRole} from '../../utils/users'
 import { idFromURL , backEndURL} from "../../utils/utils";
 
 
-
-
-
-
 const ALActions = ( { selection }) => {
     const translate = useTranslate();
     return (
@@ -249,132 +238,33 @@ export const AppList = (() => {
  })
 
 
- const DisplayAssocFlag = ( {display} ) => {
-    if (display) {
-            return <CheckIcon/>
-
-    } else {
-        return <p></p>
-    }
-}
-
- const AppAssocEditField = ( {source , label,  resource }) => {
-
-    const {setResource, setSource, setOpen, select , setSaveEnable} = useContext(ClassSelectContext);
-
-    const {setValue} = useFormContext();
-    const [displayAssocFlag, setDisplayAssocFlag] = useState (false);
- 
-
-    const handleClick = () => {
- 
-        setResource(resource);
-        setSource(source);
-        setOpen(true);
-    };
-
-    const displayValue = ( value) => {
-        if (value == null || value === '') {
-            setDisplayAssocFlag(false);
-            return '';
-        } else {
-            setDisplayAssocFlag(true);
-            return value;
-        }
-        
-    }
-
-    useEffect ( () => {
-    if (select.hasOwnProperty(source)) {
-        setValue(`${source}`, select[source]["id"]);
-
-        setSaveEnable(true);
-    }
-}, [select]) ;
-        return (
-            <Grid container spacing={2}> 
-                <Grid item xs={12} sm={8}>
-                    <TextInput label={label} source={`${source}`} format={displayValue} disabled={true} validate={required()}/>
-                </Grid>
-                <Grid item xs={12} sm={2}>
-                   <DisplayAssocFlag display={displayAssocFlag} />
-                </Grid>
-                <Grid item xs={12} sm={2}>
-                    <IconButton  type="button"  variant="outlined" onClick={handleClick} sx={ {paddingTop: 2}}>
-                        <SearchIcon/>
-                    </IconButton>
-                </Grid>
-            </Grid>
-        );
-   
-}
- const SelectActions = () => (
-    <TopToolbar></TopToolbar>
-);
-
-const UserSelect = () => {
-
-    const {resource, source, open, setOpen, setSourceSelect } = useContext(ClassSelectContext);
 
 
+export const AppUserCreate = () => {
+    const translate = useTranslate();
+    const filterToQuery = searchText => ({ _s: `%${searchText}%` });
     return (
-        <Drawer 
-        open={open}
-        anchor='right' 
-        onClose= { () => setOpen(false)}
-         >   
-
-    <List disableSyncWithLocation resource={resource} actions={<SelectActions />} exporter={false} sort={{ field: 'name', order:"DESC"}} queryOptions={{ meta:{ }}}> 
-   
-        <Datagrid 
-
-            bulkActionButtons={false}
-
-            rowClick= {(id, resource, record) => {
-                setSourceSelect(source, { id: record.id, display: record.id});
-                setOpen(false);
-
-              }
 
-         }
-        
-            >
-                <TextField source ="id" label="arolios.identifier"/>  
+        <Create mutationOptions={{ meta: {} }}>
 
-        </Datagrid>
+            <SimpleForm>
 
-    </List>
-    </Drawer>)
-}
-
-export const AppUserCreate = () => {
-    const translate = useTranslate();
-    return (
-        <Box display="flex">
-        <ClassSelectProvider>
-            <Create  mutationOptions={{ meta:{  }} }>
+                <ReferenceInput source='app' reference='apps' sort={{ field: 'name', order: 'ASC' }} perPage={100} queryOptions={{ meta: { getmany_context: 'appassocs' } }}>
+                    <SelectInput label={translate('resources.apps.name', 1)} optionText="name" optionValue="name" validate={required()} />
+                </ReferenceInput>
 
-                <SimpleForm>
+                <ReferenceInput reference="users" source="user" sort={{ field: 'identifier', order: "ASC" }} queryOptions={{ meta: { getmany_context: 'appassocs' } }}>
+                    <AutocompleteInput label={translate('resources.users.name', 1)} optionText="identifier" optionValue="identifier" filterToQuery={filterToQuery} validate={required()} />
+                </ReferenceInput>
 
-                    <ReferenceInput source='app' reference='apps' sort={{field: 'name', order: 'ASC'}} perPage={100} queryOptions={{ meta:{  getmany_context: 'appassocs'}} }>
-                        <SelectInput label={translate('resources.apps.name',1)} optionText="name" optionValue="name" validate={required()}/>
-                    </ReferenceInput>
-                    <AppAssocEditField source="user" label={translate('resources.users.name',1)} resource="users"/>
-                    <SelectInput label="arolios.user_role" source="role"  validate={required()}  choices={roleChoices()}/>
 
-                    
+                <SelectInput label="arolios.user_role" source="role" validate={required()} choices={roleChoices()} />
 
-                </SimpleForm>
-              
-          
-        
-            </Create>
 
-            <UserSelect />
 
-    
-    </ClassSelectProvider>
-    </Box>)
+            </SimpleForm>
+        </Create>
+    )
 }
 
  export const AppDomainCreate = (() => {
diff --git a/src/resources/instances/index.jsx b/src/resources/instances/index.jsx
index d8e59ce92ebd53d57d85a1ad428cc8f2a9464c83..6aed8097c7b1b7c3d7d0b5efa77e4c6fe81d715b 100644
--- a/src/resources/instances/index.jsx
+++ b/src/resources/instances/index.jsx
@@ -1,10 +1,10 @@
-import {TextField, List, Datagrid,
+import { List, Datagrid,
     ShowButton, EditButton, Loading, Show, Edit, SimpleShowLayout, SimpleForm,
      Create, TopToolbar, ExportButton, CreateButton, SaveButton, Toolbar, DeleteWithConfirmButton, SearchInput, useTranslate, EmptyClasses} from 'react-admin';
 import { useContext} from "react";
 import { AssociationMemberEndContext, ClassifierContext } from "../../utils/contexts";
 import { useProperties } from "../../utils/properties";
-import { InsertShowField , InsertListField, InsertEditField, concatenateIdFields} from "../../utils/fields" ;
+import { InsertShowField , InsertListField, InsertEditField} from "../../utils/fields" ;
 import { useResourceContext, useResourceDefinition,  useRecordContext, useCreatePath, usePermissions} from "react-admin";
 import {  idFromURL, extractResourceFromPathName} from "../../utils/utils";
 import {useParams, useLocation} from "react-router-dom";
diff --git a/src/utils/dataProvider/index.jsx b/src/utils/dataProvider/index.jsx
index 4d33df713ff5291f57684e28516a4d846f502d9b..b691612bf817a9dc6b60377f40c3db627c4e09fb 100644
--- a/src/utils/dataProvider/index.jsx
+++ b/src/utils/dataProvider/index.jsx
@@ -197,7 +197,19 @@ const CustomDataProvider = {
             const instid =ids[0] ;
             if (resource === 'apps' || resource === 'domains') {
                 return Promise.resolve ( { data: [ { id: instid }]});
-            } else { // no case implemented
+            } else if (resource === 'users') {
+                const ids = params.ids;
+                const instid = ids[0];
+                // variant of getOne
+
+                const url = `${apiUrl}/${resource}/${instid}`;
+
+                return httpClient(url).then(({ json }) => ({
+                    data: [ { id: json['identifier'], ...json} ],
+                    total: 1
+                }));
+
+            } else    { // no case implemented
 
                 let url = `${apiUrl}/`;
                 if (prefix) {
diff --git a/src/utils/fields/index.jsx b/src/utils/fields/index.jsx
index b76ccf719a5bd582d90054638213ee5292723bd2..e29edb06cf79e6d122b564ab53cd16f35a8a6aae 100644
--- a/src/utils/fields/index.jsx
+++ b/src/utils/fields/index.jsx
@@ -11,7 +11,7 @@ import CheckIcon from '@mui/icons-material/Check';
 import IconLink from '@mui/icons-material/Link'
 import * as MUI from '@mui/material';
 import { useContext } from "react";
-import { AssociationMemberEndContext, ClassSelectContext, ClassifierContext } from "../contexts";
+import { AssociationMemberEndContext, ClassifierContext } from "../contexts";
 import { useCreatePath} from "react-admin";
 import { useNavigate } from 'react-router-dom';
 import { useEffect, useState } from "react";