Error Info System error in table KNVL, Customer License in UTX2

Hello Gurus,

I created a record for new customer in XD01; I didn’t have his License # so I created the license record without any number. I entered Pending in place of License #.

Now, I am trying to update customer License # in UTX2 tax category but getting an error which says

“Express document “Update was terminated” received from author “JJim”.

I went in SBWP- Workspace to see the email in my inbox and I see the following message.

Update was terminated

System ID P01

Client 018

User JJIM

Transaction XD02

Update Key 089C8AE32EE7F1E1B067005056BA24DC

Generated 15.02.2014, 11:21:03

Completed 15.02.2014, 11:21:04

Error Info System error in table KNVL, account 714426 when deleting

Path:

XD02 -> Customer Sales Area Data -> Billing Document -> Tax Category UTX2 -> Licenses

I can delete the email and bypass the error but can anybody help me out to understand why this is happening or what I am doing wrong with table KNVL?

Thank You

Sunny