Diagnosis

No document number can be assigned to business transaction RKU1 because you have not yet assigned a number range to this business transaction in controlling area ADD2. You make this assignment in Customizing.

Procedure

Assign a number range to transaction RKU1.

Maintain Number Ranges for CO Documents.

SOLUTION:

STEP 1: Go to Transaction Code KANK and Click on Copy > Enter CO Area of "From" - "To"

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Thanks,

Adharsh K S