PR00 uploading restriction

Dear Sir,

Currently we are creating MM with all the relevant view with some default values and BOm has been created and we are giving this code directly to sales for uploading price

This activity creates lot of problem in production/ costing and upto dispatch when we create the costing view with zero value

To avoid this , there should be some restriction in uploading the PR00

Sap should not allow the user to upload the PR00 without routing and proper costing

how do we make it mandatory