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Material Creation error for Non Stock Material Type Only

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When creating a material using MM01 for non stock material type, it brings up an error message "Internal Number already Exist". This only happens to a non stock material type, others material types are been created successfully.

I checked the number assignment for the non stock material type and its an internal number range.

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Active Contributor
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Your error screen is missing?

Perhaps you are trying to create new material code with non stock material type and in MM01 screen you may have an internal number of a material code which number is already created in your system! Keep only industry sector and non stock material type to create material code by keeping all other fields empty in MM01 screen.