Hello Lahshana
user exit EXIT_SAPLCOBT_001 is not designed to change data. See FAQ 1855055 question 1.
You refer to the goods receipt batch right ?
Than you should customize that new batch should be created while creation / release of order. Than the batch functions are called and you can use user exit from batch management EXIT_SAPLV01Z_001 - 004.
BR
Sabine
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