I was asked to add a field for the last 4 digits of credit card number instead of adding a new field to the Personal Credit card table I extended this table and made a new table Personal Credit Card extension which has this field .I added some data to the table and this data also is added to Person al credit card tables as it inherits them from the extended table ,my problem is when i try to create a service case for example to close a credit card and I choose 1 of the consumers i added in the extension table no cards are shown in the credit card account field, unlike when I add a new credit card to the original personal credit card table i can find the credit card of the customer I choose .
