Summary:
If you are unable to update coding rows generated by, Matching you must enable a parameter in the Configuration Tool.
Instructions:
You can configure the Respect Coding Row’s Sealed Setting under GDM > IA_CONFIG.
For your existing invoices, the IA_INVOICE.ADMIN_SITE_ID needs to be populated in order for the coding rows to be editable if you don’t already see those populated.
To enable the parameter a, '1' must be set for this field.