Hi ​@sangland 

"The logic for selecting the Supplier location" is obtained from the Stock Items screen > VENDORS Tab > Click Default > Location as shown in the screenshot below.

Please refer to the Youtube link below.

Best Regards,

NNT

Thanks NNT. If there is no default which one does it use? (In my case AKL and DUN are like NY and LA. You don’t want the NY supplier supplying an LA customers when there is an LA supplier, so a default is not appropriate). Even with a default set and with a warehouse specified on the Inventory Supplier record it does not seem to use this.

The sales is on Warehouse CHDUN and this Item Warehouse record specifies a) that the item should be dropped shipped (the mark for PO on the SO defaults correctly using this record) and b) that there is an override supplier and Location which I expect it to use, but it does not ? 

Hi ​@sangland 

It is very difficult to automate everything when there are many exceptions. So when Drop-Ship, we need to choose a default Vendor and a default Location that represent the most common cases.

If the selected default is not practical, the system still allows you to choose it again manually.

Best Regards,

NNT

Turns out that when there is no default supplier the supplier/location with then best price is selected. 

When the supplier last price is the same for all locations then the first location code alphabetically is selected which is not good inventory management. Does any one know when the preferred supplier/location as above is used ?

Hi ​@sangland 

I do not see any out of the box solution in your case. You may have to explore customization. 

https://help.acumatica.com/(W(5))/Help?ScreenId=ShowWiki&pageid=77786a70-1f1e-4d63-ad98-96f98e4fcb0e

Regards,