Create on CI for Requisition Component is throwing error, First operand of . is NULL, so cannot acc

Hello Everyone,

I am getting below error while trying to insert a row.  it works fine with first row for all (REQ_HDR, REQ_LINE, REQ_LINE_SHIP and REQ_LINE_DISTRIB) or if my stage has only row of data each of these record. In that case code uses Collection.item() function but throws error when trying to process  when level 1 has more than one row and it tries to process second row  and uses Collection.Insertitem(). it throws error for  &oReqLine instance of  &oReqLineCollection.

Does anyone have any idea about why this error comes . Any help will be highly appreciated.  Below is the error from log file code.