Assuming that I want to change the MRP Group for a list of Material.

My text files should look something like this :-

[Variant ID] [Variant Text] &ZDISGR &ZMATNR
--> Parameter texts MRP group Material
--> Default Values M1 A001
*** Changes to the default values displayed above not effective
#01  M1 A001
#02  ''     A002
#03  M1 A003

Note : '' denotes a blank in the field. e.g. Material A002 MRP group will be replaced by a blank.

Map the data with the Office software like Microsoft Excel and save it as a tab delimited file.  It is easier to manage the data in Excel rather than directly as a text file.

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