SAFT-PT - Error - 'InvoiceCustomerIDConstraint'

[PMS]

Hello,

I'm validating the SAFT-PT file, but I received the following message:

"Error: KeyRef Constraint 'InvoiceCustomerIDConstraint' violated: 74XXXX/XX (customer number)."

Upon reviewing the file, I noticed that the Customer ID appears in the Master File with the same number but without the "/XX" suffix. Before taking any action, I checked previous SAFT-PT reports and confirmed that they include invoices with this Customer ID, even though it's still not present in the Master File.

Does anyone have any insight into this issue?

Thank you,
Bartomeu