Hi

 

I got the solution, below the solution for future developers.

I have created formula field.

 

Local stringVar strVal := '';
Local numberVar intLoop;
for intLoop := 1 to Count({?Parameter1}) do
(
if Count({?Parameter1}) = 0 then Exit For;
if intLoop = 1 then strVal := strVal & {?Parameter1} [intLoop];
if intLoop > 1 then strVal := strVal & ', ' & {?Parameter1} [intLoop];
);
strVal