Officially a bug or your opinion a bug? My opinion would be that it's a bug.

>This is a bug.
>
>Without parameters TRANSFORM it correctly works.
>A side effect is that with a format parameter, you can have ***.**** output !
>
>

>set decimals to 1
>SET FIXED OFF
>
>CLEAR
>myvar = 9999.999
>? transform(myvar)   && Prints 99.999
>? transform(myvar, "@R 9999.9999")   && Prints ****,****
>* cause: with a parameter TRANSFORM uses SET DECIMALS
>? "this is that that ago VFP before applying the formatting ",TRANSFORM(myvar,"")
>
>* a workaround for this is not simple without a UDF
>? TRANSFORM(myvar,"@R 999,999.9999") && wish 9,999.9990
>