Diagnosis
Your query includes currency amount fields or quantity fields. Eachcurrency amount field and quantity field has a reference field (acurrency key field or unit field) containing the relevant currency orunit. On reading one of the currency amount or quantity fields, thesystem discovered that the relevant unit field contained no value(SPACE). This indicates that the reference fields have not beenproperly maintained in the InfoSet used to create the query.
If the reference fields are not maintained, ABAP/4 Query is unable todistinguish between different currencies or units and therefore doesnot work correctly when calculating totals.

Procedure
Check the InfoSet. In the case of InfoSets which use logical databases,this error should not occur because the database program has to ensurethat reference fields always contain the correct values.
With InfoSets which do not use logical databases, you may have to userecord processing code to ensure that the reference fields of theselected currency amount and unit fields contain the correct values.