Solution : https://service.sap.com/sap/support/notes/485153 (SAP Service marketplace login required)
Key words :
system incorrectly generates error messages stating, maintained tax number types it1, italian customer master record, attached source code corrections, crm system, program error, tax numbers, business partner, kna1-stcd1, kna1-stcd2
Related Notes :
| 556965 | Tax numbers of category IT1 and IT2 are not created |