Inventory Planning Display (MRP)

​@rforrer This behavior is by design in Acumatica and is related to how the Create Purchase Orders process works from the Inventory Planning Display (IN406000).

Mohammad - What you are saying is the system is designed to do this to be a stop gap from accidentally ordering too much material?

​@rforrer 

It's a compromise to make it flexible and let the user change the vendor before creating the PO, rather than just creating it against the primary one. That said, one of our end users had a similar request, and the solution in their case was a customization that allowed changing the vendor on the pop-up line level (if needed), or simply proceeding with the primary vendor values prepopulated, creating grouped POs by vendor.

In my experience, there are a lot of cases where people will only want to purchase from the default vendor, and they want to make sure that people aren’t just ordering from other vendors. 

However, there are also a lot of cases where people DO want to change the vendor, or have the system look at different aspects of how to purchase that MRP does not really take into account. Some of these are things like: # of PO already at the vendor, Vendor minimum $ Discounts, Lead time, availability, quality, etc.

Unfortunately the current MRP can provide you with some tools, but without a customization, it will only allow you to cut a purchase order to those that have a vendor. 

If you are always changing, you can just populate a default vendor of “CHANGEME” and then cut a po. Once the PO has been started, you can easily change the vendor.