Diagnosis
The document is processing under company in Thailand and activated forincomming tax invoice numbering. However, the tax invoice numberingis failed because of missing number group for numbering.
The numbering group must be assigned to a combination of company code,business place, tax year, and tax code. The numbering group itself thencontrols the official numbering for input tax.

System Response
Prossing terminated - no docuement posting.

Procedure
Check the customizing on input tax numbering with the combination ofcompany , business place, year and tax code. The number range isapplied as month of tax invoice date.
IMG --> Cross Application component --> General Application Functions--> Cross-Application Document Numbering --> Thailand --> DefineNumbering Group for Tax Invoice (Input Tax)