user exit for schdule agreement at save

Hi All,

I have an issue i want to put a check in schdule agreement at save to check whether the vendor enetered in schdule agreement is the right vendor for that plant.

we have different plants assigned to same Purch orga.

we dont have any link which says the vendor plant combination in system.

so i am looking for an user exit which i can use.

Can you guys please suggest if we have any user exit for SA at save.

BR,

shaiil