>Is it possible to avoid moving record one grid where buffer mode is row table buffering and if the record it is not valid for any reason.
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>I have tried using beforerowcolchange and afterrowcolchange methods without success. The record pointer always move and the record is saved without validating.

It's possible and key method is BRCC as you thought. Basically what you do is to evaluate row validation expression and if fails prevent row change. Check Foxyclasses editgrid sample.
Cetin