We are unable to view/edit region-specific DFF attributes required for Poland e-invoicing process

Summary:

For certain countries, invoices require local compliance by capturing region-specific information at the Payables invoice header level. In our system, we have identified that there is a region-specific DFF: Payables Invoice Regional Information, Flexfield Code: JG_AP_INVOICES, which is intended to maintain the regional information needed for e-invoicing requirements. However, this DFF is currently non-editable and we are unable to modify or add data to these fields.
We have enabled Localization as "Poland" while enabling offering under Financials, but the DFF remains uneditable. Therefore, it is unclear which fields are mapped to which DFF attributes, limiting our ability to use or extend them as necessary.