Hi George
The error indicates that you have records in your Registro Table without matching records in the Pn_Qty_TBL
If you look at your Registro Table you have records numbered 1 through to 12 on the Primary Key
In your Pn_Qty_TBL you have records numbered 14, 15 and 16 on the ID related Foreign Key.
In the attached I renumbered the ID Foreign Keys in the table Pn_Qty_TBL with the numbers 1, 2 and 3
I then set a true 1 to Many relationship.
Hope this helps?