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LSMW data upload for custom transaction code and table

Dear Experts,

my case: I want to massively update data in SAP, using a custom transaction code that activates a custom table for data entry. It is pretty simple - just three columns (vendor; vendor name which is autofilled after vendor is entered; and a tick/untick field).

As I need flexible scenarios, I need to prepare the LSMW as IDoc method.

My problem: I don't know how to find out the message type and basic type for the custom tcode/table. I sought through tables WE81 (reference: and TSTC (own idea) to find out the program and related BAPI but no success, I could not find the related types.

Alternatively I tried SM30, entered the table, set data range as 'Enter conditions' and entered the field values, then I have received this message:

'Transport is not possible for the specified data'

Then I tried to find IDoc in WE02 but there is nothing for the specified time and date when I did some test changes on the vendors.

I am now kind of stuck at the very beginning.

Any Idea what I can do? All help is much appreciated.

Thank you in advance, Laszlo

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