Field help (ECCVFUNM) 

The current version of this product is displayed:

You can type in, or select a different version of this product, if required. This field is not available for entry if the product code defined in the Product field is not version managed.

If you type in a product version which is not valid on the start date a warning message is displayed. Your modifications will not be accepted.

 The version you choose must be at status 'Available to use' on the scheduled start date of this work order. If you change the proposed production start date this might cause an inconsistency with the selected version. You will not be able to release the work order (via the OK action). You must either change the product version or change the production start date for this work order.