You are using the standard functionality of attachments and implemented a custom validation to verify the files to be attached.
You have implemented this scenario in the ABC(stands for the view name) view of the XYZ(stands for the work center name) work center.
When adding a new attachment to an instance which is already created your event before save is not triggered as you expects.
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Attachment; Validation; Before; Save; , KBA , AP-RC-BDS-BO , ByDesign Studio BO definition/generation , How To
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