Error for subscriptions

I have subscriptions but they are not processing correctly.
I get an e-mail that the subscription has failed and in the error log I see the following:

Traceback (most recent call last):
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/accounts/doctype/subscription/", line 129, in create_documents
    doc = make_new_document(data, schedule_date)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/accounts/doctype/subscription/", line 166, in make_new_document
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/", line 219, in insert
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/", line 440, in _validate
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/", line 708, in _validate_mandatory
MandatoryError: [Sales Invoice, SINV-00056]: select_print_heading

I don’t really understand where this select_print_heading is coming from, because I removed it from my Print Format just to be sure.

Somebody got similar issues or a solution?

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