Diagnosis
You are working with at least one subordinate source structure. However,the source fields of the dependent structures you have entered are notcompatible with the other definitions within your LSMW object.

Procedure
Correct your source field definitions in the step 'Maintain SourceFields'. In the case of dependent structures, the key is given the samename across all fields, meaning that in the subordinate structure, atleast one source field must have the name of a field of thesuperordinate structure. During the import, this field is then used as akey for the relationship between the two dependent structures. Thismethod ensures that the hierarchical source structure you defined can beread correctly by the LSMW.
If you do not require a relational key relationship such as this, deletethe dependencies of the structures in the step 'Maintain SourceStructures'. In the case of flat structures, no fields of the same nameare required.