Service Connect - Delete BOM Lines

I am trying to write a workflow that will delete specified BOM materials based on the ECOMtl.MtlSeq value. I am familiar with using the [Delete] tag in the RowMod field, but it does not work as I expect. The trace references a rowNum = 7 which is the actual line I want to delete, but the MtlSeq value = 90. I'm not sure where to go from here.

Has anybody done this and is willing to share?

Many thanks,

Jim Pratt
Vantage 8.03.404B
Service Connect 8.3