ME898 - Order unit &1 cannot be used

SAP Error Message - Details

• Message type: E = Error

• Message class: ME - Purchasing: General Messages

• Message number: 898

• Message text: Order unit &1 cannot be used

What causes this issue?

Unit &V1& is <ZH>not</> intended as an order unit.

System Response

The system checks whether the order unit you entered is allowed for this
purchase order by comparing the order unit you entered with the order
unit that the system determined.
The system checks the potential sources of the order unit in the given
sequence. If a source is not available (if the purchase order is not
referenced to a preceding document, for example) then the system checks
the next possible source (such as a purchase requisition):
If you create a purchase order with reference to a preceding document
(purchase order, contract or request for quotation), the system copies
the order unit from the preceding document.
The <ZK>Var. OUn</> (Variable order unit) indicator must <ZH>not</> be
selected in the purchasing info record.
If you create a purchase order with reference to a purchase requisition
and the <ZK>Var. OUn</> indicator is selected in the purchasing info
record, the system copies the order unit from the purchase requisition.
In the Enjoy purchase requisition (ME51N), you can maintain the order
unit on the item detail screen on the <ZK>Source of supply</> tab.
When the purchasing info record for the combination of supplier and
material exists, the system copies the order unit from the purchasing
info record.
If you create a purchase order with reference to a purchase requisition
and the <ZK>Var. OUn</> is <ZH>not</> selected in the purchasing info
record, the system copies the order unit from the purchase requisition.
If you create a purchase order with reference to a purchase requisition
and there is no existing purchase info record for the combination of
supplier and material, then the system copies the unit of measure from
the purchase requisition item in the item overview.
If you create a normal purchase order, the system copies the order unit
from the material master.
When you create a stock transport order, the system copies the unit of
measure from the material master.
If the order unit and the unit of measure were <ZH>not</> defined in the
material master, the system copies the material's base unit of measure.
If you create a service item, the system copies the default unit of
measure.
You can define the default unit of measure in Customizing for
<ZK>External Services Management</> under <ZK>Source Determination and
Default Values -> for Client</>.
<ZH>Note</>
If the <ZK>Var. OUn</> indicator is selected in the purchasing info
record or in the material master (if no purchasing info records exist),
it means that the system can use any unit of measure that has been
defined in the material master.

How to fix this error?

RESET N1
Check the relevant documents and master records (contract or purchasing
info records).
Select the <ZK>Var. OUn</> in the purchasing info record or in the
material master, if necessary.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ME898 - Order unit &1 cannot be used ?

  The SAP error message ME898, which states "Order unit &1 cannot be used," typically occurs in the context of purchasing or inventory management when there is an issue with the unit of measure (UoM) associated with a purchase order or material document. Here are some common causes, solutions, and related information for this error:
  Causes:
  
  Invalid Unit of Measure: The order unit specified in the purchase order or material document is not valid for the material being processed.
  Configuration Issues: The unit of measure may not be properly configured in the material master or may not be allowed for the specific transaction.
  Missing Conversion Factors: If the order unit is a different unit of measure than the base unit, there may be missing conversion factors in the material master.
  Material Status: The material may have a status that restricts the use of certain units of measure.
  Plant or Storage Location Issues: The unit of measure may not be valid for the specific plant or storage location associated with the material.
  
  Solutions:
  
  Check Material Master: Go to the material master (transaction code MM03) and verify the units of measure defined for the material. Ensure that the order unit is listed and correctly configured.
  Review Purchase Order: Check the purchase order (transaction code ME23N) to ensure that the order unit is correctly specified and matches the allowed units for the material.
  Update Conversion Factors: If the order unit is different from the base unit, ensure that the conversion factors are correctly defined in the material master.
  Check Configuration: Review the configuration settings in the SAP system related to units of measure (transaction code OME1) to ensure that the order unit is allowed for the relevant transactions.
  Material Status: Check if the material has any restrictions or statuses that might prevent the use of the specified order unit.
  Consult Documentation: Refer to SAP documentation or help resources for specific details on unit of measure settings and restrictions.
  
  Related Information:
  
  Transaction Codes: 
  
  MM03: Display Material Master
  ME23N: Display Purchase Order
  OME1: Maintain Units of Measure
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to this error message.
  User Roles and Authorizations: Ensure that the user has the necessary authorizations to perform actions related to the material and purchase order.
  
  If the issue persists after checking these areas, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in materials management or purchasing.