SAP MM ERROR TUTORIALS-
Common Error Message."Internal number assignment is not possible for the material type LEARN INACTIVE RAW MAT" typically occurs because the material type in question is configured to use external number assignment rather than internal number assignment in SAP.....
FOLLOW STEPS-
Solution-TCODE -MMNR
The material type is set up for external number assignment in transaction MMNR (Maintain Number Ranges for Material).
Internal number assignment is try to creating a material of this type
FOLLOW PATH-SPRO → Logistics → Materials Management → Material Master → Basic Settings → Maintain Number Ranges (MMNR)
Solution-TCODE -GO TO MMNR
SELECT GROUPS-BUTTON
SELECT -LICR-LEARN INACTIVE RAW MAT
-SELECT-ASSIGN MAT ELEMENT GROUP
-SELECT-YOU CAN ALSO CHANGE GROUP LEVEL –MK01(GROUP 2)
-Check
-Check the number range interval assigned to this material type.
-Also check-internal number assignment is required, ensure that the number range for this material type is configured for internal assignment (Number range should not have the checkbox "Ext." ticked).
SAVE.