READ_MATERIAL Method ends in ASSERT violation error

Hi,

We are interested in implementing BADI USMD_SSW_RULE_CONTEXT_PREPARE as we want to enhance the user agent determination using the Supplier Account Group (LFA1-KTOKK)

We have implemented everything according to the how-to document. While testing we keep getting an assert violation in our method READ_SUPPLIER (which is copied from the example implementation method READ_MATERIAL)

We tested the READ_MATERIAL method in the example implementation and we are also still getting the same assert violation error. We have implemented the pre-req notes 1700197  and 1837696.

Has anyone else come across this issue and any ideas what we can do to fix this?

Thanks,

Luqman