SAP Knowledge Base Article - Public

2184902 - Cannot Assign Expense Item To Invoice Item Due To Incompatible Unit Of Measure (UoM)


While creating assigning not invoiced project expense to invoice items the system is throwing error message as Cannot assign expense item to invoice item due to incompatible units of measure (UoM). Check if the UoM can be converted. If conversion is not possible, assign the expense to another invoice item.

Reproducing the Issue

  1. Go to Project Management work center.
  2. Choose the Invoice Preparation view.
  3. Choose Not Invoiced Time and Expenses sub-view.
  4. Choose show All Active Customer Projects.
  5. Search the Project XYZ.
  6. Choose New button and Manual Project Invoice Request.
  7. Navigate to  Define Invoice Item tab.
  8. Choose Propose Invoice Items button and choose From Time and Expenses: Per Employee/Party and Sales Order Item.
  9. Navigate to Select Time and Expenses tab.
  10. Choose Propose Invoice Item Assignments button and choose For All Time and Expense Items system throws above error message.


There could be two reasons for the above mentioned error message.

  1. If the Not Invoiced Time and Expense items UoM and the Sales Order Items UoM incompatible and if there is no quantity conversion is not maintained for that specific service in the master date .
  2. If you are trying to assign the Not invoiced expense items to the Sales Order item type Service - time and material (project) or Expense - fixed price (project) due to incompatibility of the item type, in order to assign expense items to the Sales Order item type should be as Expense - time and material (project) or  Expense - fixed price (project) .  


System works as designed.


KBA , AP-PRO , Project Processing , How To


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