Standard Fields are not available in BAPI Successors I_MaterialDocumentTP

[Priya_Saindhavi22]

Hi All,

I am trying to post GR using BO I_MATERIALDOCUMENTTP. Required to pass extension fields such as WRF_CHARSTC1 (Characteristic Value 1), WRF_CHARSTC2 (Characteristic Value 2). But, it is not available when using MODIFY ENTITIES OF I_MaterialDocumentTP and it is not extensible also. Earlier in standard BAPI , these fields  are filled under extension structures.

Any suggestions ?

RISE with SAP  MM (Materials Management) ABAP RESTful Application Programming Model