How To Fix RU159 - Internal assignment of doc. no. error record: last number assigned

RU159 - Overview

• Message type: E = Error

• Message class: RU - Messages for order completion confirmation

• Message number: 159

• Message text: Internal assignment of doc. no. error record: last number assigned

What causes this issue?

The last number has been assigned in the number range "01" for object
AFFW_NR. Any further number assignment would cause a termination,
unlessyou manually change the definition of the number range.

How to fix this error?

You can either increase the upper limit of the number range, or or
reset the number range. You should, however, make sure that the same
number is not assigned twice.

Error message extract from SAP system. Copyright SAP SE.

RU159 - Details

• The SAP error message RU159, which states "Internal assignment of doc. no. error record: last number assigned," typically occurs when there is an issue with the document number assignment in the SAP system. This error can arise in various modules, such as Financial Accounting (FI) or Controlling (CO), when the system attempts to generate a document number for a transaction but encounters a problem with the number range.
  Causes:
  
  Exhausted Number Range: The number range for the document type you are trying to use has been exhausted. This means that all available document numbers in the defined range have been used up.
  Incorrect Number Range Configuration: The number range may not be properly configured in the system, leading to issues in document number assignment.
  Authorization Issues: The user may not have the necessary authorizations to access or use the number range.
  System Configuration Changes: Recent changes in the configuration of number ranges or document types