SAP Message Q8008 - Data ID has already been used by &

Diagnosis The external data you want to analyze is stored in the performancedatabase with a name key. The key is a two-character alpha-numeric key.You can select any key from 'A1' to 'ZZ' as long it has not been usedfor other external data. Procedure Choose another name key between 'A1' and 'ZZ'.