How To Fix O1581 - Base UoM of shipment is not = purchase order item quantity schedule.

SAP Error Message - Details

• Message type: E = Error

• Message class: O1 - IS-Oil : Message pool exchanges

• Message number: 581

• Message text: Base UoM of shipment is not = purchase order item quantity schedule.

What causes this issue?

The base unit of measure in the quantity schedule of the purchase order
item is different from the shipment.
The base units of measure must be the same.

System Response

The system does not accept the assignment of this purchase order item.

How to fix this error?

Please use another purchase order item.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message O1581 - Base UoM of shipment is not = purchase order item quantity schedule. ?

  The SAP error message O1581, which states "Base UoM of shipment is not = purchase order item quantity schedule," typically occurs during the processing of goods movements, particularly when dealing with purchase orders and shipments. This error indicates a mismatch between the unit of measure (UoM) used in the shipment and the UoM defined in the purchase order item quantity schedule.
  Cause:
  
  Unit of Measure Mismatch: The base unit of measure (UoM) for the shipment does not match the UoM specified in the purchase order. This can happen if the shipment is being processed in a different UoM than what was defined in the purchase order.
  Conversion Issues: If there are conversion factors defined between different units of measure, and the system is unable to convert the quantities correctly, this error may arise.
  Incorrect Configuration: There may be configuration issues in the material master or the purchase order settings that lead to discrepancies in UoM.
  
  Solution:
  
  Check Purchase Order: Review the purchase order to confirm the base UoM defined for the item. Ensure that it matches the UoM being used in the shipment.
  Adjust Shipment UoM: If the shipment is being processed in a different UoM, adjust it to match the UoM of the purchase order. This can often be done in the goods receipt or shipment processing screen.
  Review Material Master: Check the material master data for the item in question. Ensure that the UoM settings are correct and that the base UoM is properly defined.
  Conversion Factors: If applicable, verify that the conversion factors between different units of measure are correctly set up in the system.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling UoM issues in your version of SAP.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes such as ME23N (Display Purchase Order), MIGO (Goods Movement), or MM03 (Display Material) to check the relevant data.
  User Exits and BAdIs: If the issue persists, consider checking for any user exits or BAdIs that may be affecting the UoM handling in your system.
  SAP Notes: Look for relevant SAP Notes that may address known issues or provide patches related to UoM handling.
  Testing: After making adjustments, perform a test transaction to ensure that the error does not reoccur.
  
  By following these steps, you should be able to resolve the O1581 error and ensure that the UoM for shipments aligns with the purchase order requirements.