Hi @Anonymous
Please follow the below steps to change the 'Lookup Field' property.
1. You have to use 'Send an HTTP request to SharePoint'
2. Select the site and list
3. Select 'Post' for the method
4. For the 'Uri' try to use the below with your list name
/_api/web/lists/getbytitle('Your listname')/items
5. For the headers try to use the below
Key | Value
accept | application/json;odata=verbose
content-type | application/json;odata=verbose
6. For the body use the below
{
'__metadata': { 'type': 'SP.Data.<List internal name>ListItem' },
'SampleColId': 'Id of the parent list item',
'SampleCol1Id':{'results':[Id's of the parent list item]}
}
In the above example, 'SampleCol' is the lookup column name and it should be given like that and the values to be passed is the item id of the lookup list item. The same for the multi lookup column but the value has to be passed is the array of Ids.
Hope it helps, please like it or mark it as a solution if it resolves ur clarification or issue
-Sudharsan K...
