How to selectively choose data components from multi-line container element

Hi experts,

Our SAP environment is ECC 5.0. I am in the process of customizing workflow that associates with BUS2105 (purchase requisition at overall release level). Within the BUS2105 - SAP has provided a method GETDETAIL. Within this method, it returns detail information about the requisition line items. There's a export parameter RequisitionItems with ABAP dictionary reference table BAPIEBAN. When I called this method, I have binded a workflow multi-line container element with the same ABAP dictionary reference BAPIEBAN.

Within this BAPIEBAN structure, it has many components (roughly 132 data component) relating to the PR line items. Once a workflow task has executed this method in the background and populate the data back to the workflow container. I need to send an email notification to the user, I would like to be able to selectively choose only needed data components from this multi-line container element. When I used the insert expression to choose this container element - since it is a multi-line, it doesn't allow me to selectively choose particular components within a structure. I was wondering, is it possible to use techniques within workflow so that I don't have to write a method (BAPI) for this?