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E9.2 UDO Grid column for sub ledger value in P4210 detail form


Hi ,
We are on E9.2 and planning to Use UDO extension column on grid for sub ledger in P4210 detail form . Since we don't have F4211 edit line validation for sub ledger and sub ledger type so how to validate the UDO column sub ledger value when the user inputs whether is right or wrong through even rules in so detail ?
E9.2 Developer