How To Fix IO304 - Only &2 serial numbers entered instead of &1

SAP Error Message - Details

• Message type: E = Error

• Message class: IO - Plant Maintenance: Object List

• Message number: 304

• Message text: Only &2 serial numbers entered instead of &1

What causes this issue?

There is a serial number obligation, so the number of
<DS:GLOS.serial_number>serial numbers</> must equal the number of serial
numbers in the <DS:GLOS.material_document>material document</>.
You can post the operation only if you entered the correct number of
serial numbers previously.

System Response

Depending on the context in which the error arises, the system continues
processing, or the required function cannot be
performed.

How to fix this error?

You have the following options, for example:

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Check that the serial numbers are entered fully.
If necessary, display an error log.
If necessary, contact your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message IO304 - Only &2 serial numbers entered instead of &1 ?

  The SAP error message IO304 indicates that there is a mismatch between the number of serial numbers that were expected and the number that were actually entered. Specifically, the message states that only a certain number of serial numbers (represented by &2) were entered when the system expected a different number (represented by &1).
  Cause:
  This error typically occurs in scenarios where serial number management is involved, such as during goods movements, inventory management, or when processing deliveries. The mismatch can happen due to several reasons:
  
  Incorrect Data Entry: The user may have entered fewer serial numbers than required.
  System Configuration: The system may be configured to expect a certain number of serial numbers based on the material master or other settings.
  Batch Processing: If the operation involves batch processing, the system might expect a specific number of serial numbers based on the batch size.
  Incomplete Transactions: The transaction may not have been completed properly, leading to an inconsistency in the expected versus actual serial numbers.
  
  Solution:
  To resolve the IO304 error, you can take the following steps:
  
  Verify Input: Check the number of serial numbers you are trying to enter. Ensure that you are entering the correct number as expected by the system.
  Review Configuration: Look into the material master data and any related configuration settings to ensure that they are set up correctly for serial number management.
  Check Transaction Details: If you are processing a transaction (like a goods receipt or delivery), review the details to ensure that all required serial numbers are accounted for.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on serial number management and the context in which the error occurred.
  Contact Support: If the issue persists, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.
  
  Related Information:
  
  Serial Number Management: Understand how serial numbers are managed in your SAP system, including how they are assigned, tracked, and reported.
  Material Master Data: Familiarize yourself with the material master data settings related to serial numbers, including the configuration of serial number profiles.
  Transaction Codes: Be aware of the relevant transaction codes (like MIGO for goods movements) that may be involved in the process where the error occurred.
  SAP Notes: Check for any SAP Notes related to this error message for additional insights or patches that may address the issue.
  
  By following these steps, you should be able to identify the cause of the IO304 error and implement a solution to resolve it.