SAP version used in this post: SAP ERP Central Component (ECC) 5.0
If you don't know what a Schedule Line category is, you may want to start here first.
Schedule Line catagory is automatically determined in an order (but may be changed manually if set up) based on the following:
Schedule Line category = Item category + MRP Type of material.
Example: If Item category is TAN and MRP Type is VB, then the Schedule Line category is CV
Schedule Line Categories are configured at:
IMG: Sales and Distribution > Sales > Sales Documents > Schedule Line > Define Schedule Line Categories - transaction VOV6
Lets look at Schedule Line Category CV
The key fields here are:
Movement Type (601): This is the movement type that will take place when a Goods Issue is done.
Req. Assembly: Requirement visible in MM (example in tcode MD04)