The guide of defining requirements type
STEP 1 Find the menu path in SAP Reference IMG.
Follow the menu path “SAP Customizing Implementation Guide->Sales and Distribution->Basic Functions->Availability Check and Transfer of Requirements->Transfer of Requirements->Define Requirements Types”. To know more information about SAP Reference IMG, read our article http://www.nicesap.com/ps/how-the-reach-sap-reference-img-interface.html
STEP 2 Select one of the requirements types and click the button “Copy As…”
STEP 3 Input the name of the new requirements type and press Enter, then save it. The new requirements type has been created successfully.