Hi ,
Insist of Table name , you have to use the Item reference.
For example,
Am fetching the value in find mode from one UDF to an other UDF,
Form English to Form French,
For this you have to use this FMS "SELECT $[$U_formeng.0]" insist of "Select $[OITM.U_formeng]"
I have modified your query , try and let me know your feedback.
SELECT T0.[code], T0.[name] FROM [dbo].[@6LEVEL] T0 INNER JOIN [dbo].[@5LEVEL] T1 ON T0.[U_MOD] = T1.[Code] WHERE T0.[U_MOD] = (select $[$.U_Producer.0])