Enhancement of 2LIS_02_ITM from structure RM06E

Hi experts,

We need to extract fields RM06E-LTEX1 (long text) and RM06E-KZLTX (More Text Exists which is a flag) from R/3 into BW however RM06E is a structure in R/3.

The fields concerned are located in one of the Purchase Order screens (ME21).

I need to enhance the Datasource 2LIS_02_ITM (or define a new generic DataSoure) with fields LTEX1 and KZLTX from the R/3 structure RM06E.

I need to find out what table will hold these text informations. Does anyone know how I can find this?

Many thanks

Moha