UNSAccountBInUNSGroupB Update - Write permission denied for value "Group".

Question

When trying to update record in UNSAccountBInUNSGroupB I'm getting error: 
 [810222] Error executing script 'VRS_UNSAccountBInUNSGroupB_Update'. at VI.ObjectBrowser.Parts.ScriptDebuggerControl.mnuRun_Activate(Object sender, EventArgs e) at VI.DB.Scripting.ScriptRunner.Eval(String key, Object[] parameters) [810025] User accounts: assignments to system entitlements: Write permission denied for value "Group". at VI.DB.Entities.PermissionsEntityColumnBase.<SetValueAsync>d__17.MoveNext() at VI.DB.Entities.PermissionsEntityColumnBase._CheckCanEdit() 
 I'm using script: 
 Public Function VRS_UNSAccountBInUNSGroupB_Update(ByVal UID_UNSAccountB As String, ByVal UID_UNSGroupB As String) As Boolean

 Dim UNSAccountBInUNSGroupB As IEntity = Nothing
 Dim f As ISqlFormatter = Connection.SqlFormatter
	Dim result As String = ""
	
	If Session.Source.TryGet( Query.From("UNSAccountBInUNSGroupB") _
 .Where(f.Comparison("UID_UNSAccountB", UID_UNSAccountB, ValType.String, CompareOperator.Equal, FormatterOptions.NonUnicodeLiterals)) _
 .SelectNonLobs, UNSAccountBInUNSGroupB )
 UNSAccountBInUNSGroupB.PutValue("UID_UNSGroupB", UID_UNSGroupB)
	End If
	
	Using uow As IUnitOfWork = Session.StartUnitOfWork()
 uow.Put(UNSAccountBInUNSGroupB)
 uow.Commit()
 End Using

 Return True

End Function 
 
 PS. There is no account definition assigned to UNSAccountB

Markus Weiss-Ehlers · Accepted Answer

The error message is saying, that you do not have the permissions to write the group property, which is the caption for your column UID_UNSGroupB you are trying to change. 
 
Reason for that is, that you cannot update any of the primary key values in your assignment table UNSAccountBInUNSGroupB. 
 
From the code I assume, that you want to change an existing group membership for an user. If so, you need the delete the old membership and create a new one.