Crystal Reports: Error in formula

 {GLAS_GL_TRANS开发者_如何学GoACTIONS.GLTR_PSTNG_TYPE} + {GLAS_GL_TRANSACTIONS.GLTR_PSTNG_NO} 

I JUST invoke these two fields from database and concatenate(+) by usin string(concatenate)

when i save this i got error like

string is required....... what should i do? provide info......

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As I mentioned to you in Concatenate Crystal

you should use

{YourDataSource.Field1} & " " & {YourDataSource.Field2}

Make use of &, not +