A string array is required here

Question

i have a numberic parameter which allows multiple selection
i want to join the parameters in the report header to display the values selected
i use this
if ({?Salesperson})='ALL' then 'ALL' else 
join ({cust.CTTX40},', ')
i get a stringarray is required here.
({?Salesperson}) is a string
cust.CTTX40 is a string
how do i get it to work

Answer 1

Hi Sharon, 
I tried this a couple of different ways including looping with Basic syntax and none will work if  you do not already have an array. 
Join only works with string arrays and CTTX40 isn't an array. 
Dim MyArray
Dim i
i = 1
MyArray = ""
Do While i <= 14
    myArray = myArray & ToText ({CC_CLTBL.TBCMSC}, 0, "", "") & ", "
    i = i + 1
Loop
formula = myArray
I tried creating a looping formula and it looped fine but because it was in the Report Header, I got the same value in each element.  This is because the Report Header can only see the first record in the recordset. 
If I dropped this into my Detail section it would work fine because it's getting each record and appending it. 
Really, the only way to do what you want would be with a subreport, link the parameter to it and create a running total like: 
WhilePrintingRecords;
Shared StringVar myArray;
If {?pm-Salesperson} = "ALL" Then myArray := "ALL"
Else myArray := myArray & ", " & {cust.CTTX40};
Drop this into the Detail section of the subreport and then you can use the myArray in your main report or just display it. 
Good luck,
Brian