Solution : https://service.sap.com/sap/support/notes/498730 (SAP Service marketplace login required)
Key words :
t001z_vat paval char 48 0 parameter 3, gs_hd_gen-t001z_vat ne initial, field gs_hd_gen-t001z_vat, field 'gs_hd_gen-t001z_vat', section 1a requires, legal change occurs, copy template info_unsere_steuernr, standard print program, tax number assigned, &gs_hd_gen-t001z_vat&
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