Could you know how do we customize the below conditions
1) For a supplier, each item of a purchase order must contain the same material.
For example, if there are several items in a purchase order, all the items should contain the same material.
2) For a supplier, all the purchase order has a limited number of items.
For example, we fix on that we can't create a purchase order with more than 50 items.
I would like to know if there are any standard SAP ways to customize the above conditions.
Thank you in advance.