Hi ,
UB for plant to plant stock transfer with in the company code.(same company code)
NB for plant to plant stock transfer between company codes.( different company codes)
IN your case NB document type.
if the valuation class for the same article is different in both company, any problem transferring?
For Inter STO, accounting entries will be posted separately for each company code.
when supplying plant issuing goods in the step of PGI , accounting entries created for supplying plant and when goods receiving in receiving plant , accounting entries will be created for receiving plant.
even though different valuation classes also there is no problem .
example : if suppose A company supplies curd . So here curd is finished product for A company. A producing curd and stock transfer to B company code. In B curd may be raw material.
Hope it is helpful.