Dear Pam,
You want to ensure that your users have to maintain one base price as per the division before saving the sales order and moving to delivery.
I feel this could be done through the standard system itself. I tried working on your scenario and here are the results:
1. Pricing Procedure snapshot:
In the pricing procedure, I have maintained 3 base price condition types (copy of PR00) and checked them for manual entry. Then at step 40 - Gross Value, assign a subtotal 1. This could be the base for calculating your discounts also. The Gross value would pick up the manual price condition entered by the user and store it in Subtotal1 - KZWI1.
2. Maintain In-Completion Log with the field KZWI1 at the item level.
This way you ensure, if the subtotal 1 is incomplete you would get a message accordingly for completion.
3. Create Sales Order to check the results:
I created a Sales Order and checked the Item Conditions, Subtotal was showing 0. I tried saving the doc, the system gave me a incomplete doc message once I manually entered the value for HR00, everything worked fine and I was able to save the doc.
I hope this addresses your issue.
Regards
Swaroop