Hi Dittaporn,
I think I know the solution to your problem. Start tcode OBBZ-Change View "Substitution in Accounting Documents": Overview. In the column "Activation level" for your company code choose 0-Inactive.
After that, run again tcode KB31N and try to post something, it should work. Please give me a feedback if this was a solution to your problem.
Best regards,
Vojislav Marjanović