I found there is discrepancy in MARC and WLK1. While listing through WSM3 transaction code.

[arin2018]

while listing through WSM3 Transaction code, we are receiving once Express document message stating

" No Entry in key field in Plant segment of Material xxxxxx". But, have checked the Reference article and Reference Site properly, could not find any discrepancy though. In my case, the WLK1 entry is generated with the Article and Assortment, but without MARC Entry.  Gurus kindly help to resolve this issue.