Trigger automatic batch determination for classification

Dear All;

We want to Trigger automatic batch determination for classification.

We are capturing Printed MRP price on the products at the time of GRN.

We have created a characteristic for the same and assigned to batch class, which is in turn assigned to Product code.

As of now we are maintaining MRP price as manual input field, but we want to provide a drop down to users with applicable MRP Price for the product code.

MRP price should be maintained against the product code, user would be allowed to select only from these MRP.

If there is any standard table where we can maintain these details and how can we Trigger automatic batch determination for classification.

regards

Rahul Shashank