In QNE Optimum, Customization Center, How to create a validation rules to control the selling price cannot less than minimum price
1. Go to Tools>Customization Center>Validation, right click and select Add
2. select RuleCriteria and enter the below:
TargetType = QnEBS.BO.Sales.SalesInvoiceDetails
Criteria = [UnitPrice] >=[Stock.MinPrice]
TargetContextIDs = Save
CustomMessageTemplate = You can define your own error msg here.
Note: You can download the sample screen shots HERE.