How To Fix ME898 - Order unit &1 cannot be used

ME898 - Overview

• 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.