Crystal Reports Populate Array with Parameter Field

Message

     Hello 

I have a difficult task regarding displaying parameter fields with multiple values. I like to display all values on the report. Maybe anyone has an idea?! would be great!!

Here is a detailed description:

When my report starts the user can select which states to display. This is done by a parameter field where the user can select multiple values. If I put the parameter field on the report, just one value is shown. 

To solve the problem, I have used an array. Here is the code

Name of Fomula: DeclareArray

WhilePrintingRecords;
Global stringVar array My_Array;
Global numberVar N:=distinctcount({? State});
Redim My_Array[N];
Global numberVar ncounter:=0;

I have put this formula in the report header

The next formula I have declared is:

Name of Fomula: DisplayArray

WhilePrintingRecords;
Global numberVar ncounter;
Global stringVar array My_Array;
Global numberVar N;
If ncounter < N Then (ncounter:= ncounter + 1;
    My_Array[ncounter]:={? State};)

However, if I check the formula I get the following error message:

"This array must be subscribed. For example array"

I plan to put this formula into the details section. The array will be show with:

Name of formula: PopulateArray

WhilePrintingRecords;
Global stringVar array My_Array;
"States: " + Join(My_Array,", ")
I will put this formula in the report footer. 

My question: Does anyone know what the error message means? 

Any hints and ideas regarding error message or how to approach the problem are more then welcome 

Cheers
Sven

Edited by Sven - 18 Jul 2008 at 11:48am