How to pass a table of values as input to a BAPI

I have a BAPI that is expecting a table as an input. How do I do that in Visual Composer 7.1.

I am getting an error when I try to pass the multiple selected rows from a table.

com.sap.mw.jco.JCO$Exception: (127) JCO_ERROR_FIELD_NOT_FOUND: Field null not a member of

Please advise

Thanks