Configuring the Material Master Material Type:

OMS2 - Material Type Maintenance - Create/Change/Display

Steps:-

• transaction OMS2
• click Change
• key in the Material Type you want to change e.g. FERT then hit enter

If you tried to change from FERT to HAWA in 4.6x, you will receive an error message :-

The material type cannot be changed. This is not allowed if only external procurement is defined for the new material type, or if the new material type has a different account category reference than the old material type.

To overcome it, goto OMS2 and change the HAWA material type.

In the Internal/external purchase orders sections:

                                         Original                 Changes
Ext. purchase orders               2                           1
Int. purchase orders                0                           1

SAP MM Reference Books:
SAP Material Management Interview Questions, Certification and Configuration Books

Goto:
SAP MM Purchasing

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SAP MM (Materials Management) Configuration Hints and Tips

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SAP ABAP/4 Programming, Basis Administration, Configuration Hints and Tips