User Exit error message in V45A0002 enchancement

hi ,

To display default sold-to-party in VA01 in the enchanement V45A0002 in that EXIT_SAPMV45A_002 and in the include ZXVVA04 i wrote code like this E_KUNNR = 301.

While checking it is showing the message 'The type 'XXXXXX' Is Unknown. Kindly give me the suggestion to sort out this issue.

Thanks in advance

Regards

R.vijai