LSMW for movement type 309

Hi All,

We have a new requirement wherein we need to transfer stock from material to material (everything else remains same - valuation area, Sloc, base UoM etc.) We have thousands of materials to materials movements to be posted.

I referred few threads which explains how we can achieve this using LSMS.

Example:

LSMW for movement type 309

My question is - once we select a method, say BAPI or IDOC as per above thread (as mentioned by Jurgen), how can create a corresponding input file that can handle multiple lines to be used in LSMW?

Is it going to be a flat file?

What I am doing is - I am creating source fields based on required fields like posting date, material, plant. Sloc etc. and based on source field I am creating a text file.

Is this correct approach?

Thanks,

Pat.