MB1B vs. BAPI_GOODSMVT_CREATE

Hello, 

When utilizing MB1B with a question 413E (sales bid to income order), the WBS tract (MSEG-PS_PSP_PNR) successful the worldly papers is NOT populated. When utilizing BAPI_GOODSMVT_CREATE, that aforesaid tract is populated. Other than that, everything is works fine. Can anyone archer maine if determination is simply a mode to archer the BAPI to not populate the WBS?

Thank you!