BDC_INSERT transaction is invalid

Hi all,

I'm trying to run LSMW program (created by someone else) for Asset management (Tcode AS91) with data coming from an .xls file. But when I execute the "create BI session " step , it gives me an error saying "BDC_INSERT transaction is invalid".

I went into the conversion program to double check the transaction code that is supplied to the BDC_INSERT and it is AS91.

Appreciate any suggestions .