Multi rows create in SAP

Does anybody know how to solve this?
I like to create the multi rows in SAP. the following error is the problem now.

I have data table,Variable type Datatable (dt_NewHeader) that has 2 rows, i loop those two rows in ForEach and assign the Current Row to (row_documentheader)which variable type is DataRow.
Because in SAP, DOCUMENTHADER’s data type is DataRow .

Assign the SAP in ForEAch