You have entered a combination of material type and valuation area forthe plant that is not defined in the system.
An entry made up of this combination is normally created automaticallyfor all valuation areas in table T134M if you execute the functionEdit material type> in Customizing for thecorresponding material type and then save your data.
The absence of an entry can be due to you setting up and assigning anadditional plant to a company code. Although the system then determinesthe respective company code automatically, it does not create an entryin table T134M for the existing material types in this case.
Contact your system administrator so that the corresponding combinationcan be entered in table T134M.