How To Fix LK055 - Several inventory numbers cannot be processed simultaneously

SAP Error Message - Details

• Message type: E = Error

• Message class: LK - WM -> SUB connection messages

• Message number: 055

• Message text: Several inventory numbers cannot be processed simultaneously

What causes this issue?

You have tried to call the function module L_INV_COUNT. A table that
contains the different inventory numbers was transmitted. The function
module can only return the count results of an inventory number for
each call.
In particular, the reason could be an incorrect IDOC structure if you
are implementing the WCU interface.

How to fix this error?

Check whether at least one control record IDOC_CONTROL was transmitted
when the inventory count results were sent for each inventory number.
Several control records can be sent with the structure E1LINVX for each
inventory number, but no inventory number change can take place.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message LK055 - Several inventory numbers cannot be processed simultaneously ?

  The SAP error message LK055, which states "Several inventory numbers cannot be processed simultaneously," typically occurs in the context of inventory management and handling multiple inventory items or batches in a single transaction. This error can arise in various scenarios, such as during inventory counts, adjustments, or when processing goods movements.
  Cause:
  
  Multiple Inventory Numbers: The error is triggered when the system detects that multiple inventory numbers (or batch numbers) are being processed at the same time, which is not allowed for certain transactions.
  Transaction Type Restrictions: Certain transactions in SAP require that only one inventory number be processed at a time. This is common in processes like physical inventory counts or adjustments.
  Configuration Issues: There may be configuration settings in the system that restrict the processing of multiple inventory numbers simultaneously.
  
  Solution:
  
  Single Inventory Number Processing: Ensure that you are processing only one inventory number at a time. If you need to process multiple items, do so in separate transactions.
  Review Transaction Type: Check the type of transaction you are attempting to perform. If it inherently requires single inventory number processing, adjust your approach accordingly.
  Batch Processing: If you are trying to process batches, ensure that the system settings allow for batch processing, or handle each batch individually.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidelines on the transaction you are using to understand its limitations regarding inventory numbers.
  System Configuration: If you believe the error is due to a configuration issue, consult with your SAP administrator or technical team to review the settings related to inventory management.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common errors.
  Transaction Codes: Familiarize yourself with relevant transaction codes (e.g., MI01 for physical inventory, MIGO for goods movements) and their specific requirements regarding inventory numbers.
  User Training: Ensure that users involved in inventory management are trained on the correct procedures for handling inventory numbers to minimize errors.
  
  If the issue persists after following these steps, it may be beneficial to engage with SAP support or your internal IT team for further investigation.