Selected blocking reason deleted: invoice & released

What causes this issue?

You deleted the blocking reason on which the cursor was positioned. This
blocking reason was the last block for this invoice item. Since the
other items in this invoice do not have any blocking reasons, the
invoice is no longer blocked for payment. If you confirm the base date
by pressing ENTER, the system will automatically release the invoice.

Error message extract from SAP system. Copyright SAP SE.