bholus7 has just posted in the SAP MM Forum (Material Management Module) forum of Wiki Newforum under the title of Sap mm faq.
This thread is located at http://www.wikinewforum.com/showthread.php?t=6000
Here is the message that has just been posted:
***************
*Have any one you done this in IM: Inactivating the standard Movement Types. Say for eg. I don't want to end user to use this MType 501- Receipt without ref to PO.*
*I don't want to delete this movement type, being an SAP standard one. One option what I thought of is to control in the authorisation profile, profile to exclued selected movement types.*
*Is there any other way we can do this?*
You can delete the accounts assignments which are used for 501 movement type, in T030 table. Transaction code is OBYC.
or
1. Use transaction OMJJ
2. Enter movement type 501
3. Remove MB01 from allowed transactions
***************