It is returned whenever you try to enter the ID in the field for entering supplier ID of Items register, otherwise already recorded in the field. The following message is returned warnng you about this:

Nonetheless, this ID is recorded in the register. Of course you can change it subsequently.

Close the window clicking .

Solution:

1. Perhaps this record is correct (e.g. one record in your Items register represents the item used in ordinary sales, another on the other hand represents the item used in commission sales). In this case you need not change supplier ID.

2. In the opposite case you assign to the item a new, that is, another supplier ID.