Dynamic SDTE, how to call Parameter value 'A' in the isometric

Dears

In my Catalogue, value of Parameter 12 is 'A'

Now I want to have Description in Isometric as "XYZ-A"

So I am trying following in the R text of SDTE

Rtext ( 'XYZ-' + STR ( ATTRIB PARA[12 ] ) )

But in design, when I Query DTXR, it gives below result

Dtxrtext XYZ-531442

So instead of XYZ-A it gives XYZ-531442

Please advise, what should I write in place of + STR ( ATTRIB PARA[12 ] ) to get desire output. Or any other suggestion.

Your support is appreciated.

Dears

In my Catalogue, value of Parameter 12 is 'A'

Now I want to have Description in Isometric as "XYZ-A"

So I am trying following in the R text of SDTE

Rtext ( 'XYZ-' + STR ( ATTRIB PARA[12 ] ) )

But in design, when I Query DTXR, it gives below result

Dtxrtext XYZ-531442

So instead of XYZ-A it gives XYZ-531442

Please advise, what should I write in place of + STR ( ATTRIB PARA[12 ] ) to get desire output. Or any other suggestion.

Your support is appreciated.