Local revision vrs Revision

I am hoping someone can explain why there are two revision varriable fields in EPDM THe loval revision and the Revision. To my knowledge, there is alway only one current revision of any type of file, not two, yet EPDM has two revision fields that can be diferent. This causes a lot of confusion with the users. I have overcome this by setting up an increment revision cycle in my workflow to insure that they always match, however I still have no explanation as to why solidworks made two revision fields.

Thanks.

SolidworksSolidworks Pdm enterprise Pdm