I am using vTiger 7 and creating a custom Entity Module using vtlib/tools/console.php but somehow when i save the data it shows me error "Record You are trying to access is not found" although it saves the data in tables but when i try to show the data it shows the same error.
I had same issue and I solved the problem by creating a table manually.
See the schema of table vtiger_leads_user_field to create new table having same schema.
Create new table as vtiger_<your entity module name>_user_field. In vtiger 7, when you create new module the vtiger_......._user_field table is not being created.
Some other problem also with vTiger 7 but I think this problem i solved by just creating a table in DB, which must be created automatically by vtiger 7.
NOTE: I created my module using custom PHP script (Module Creator).