BADI for Duplicate material Validation in BOM apps?

We are implementing validation process to forestall the inclusion of duplicate materials successful our Bill of Materials (BOM).

For validation intent we are utilizing BOM_BEFORE_SAVE Badi. Currently Validation are moving for Alternative 1 & 2 BOM. We required for individually (If Alternative 1 is alteration mode oregon Alternative 2 is alteration mode).

How bash we bash a validation cheque astatine alternate BOM Level 1 oregon 2 and not some ?

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