N. Troubleshooting Guide : Running a Completed Application : Parameters
 
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Parameters
If your ABF or Vision application passes parameters between frames or procedures, be sure that:
You have used the byref keyword with any parameter whose value is to be changed when it is returned to the calling frame
You are using the correct 3GL data types to receive any parameters that you pass to 3GL procedures
Your parameter list for a call system statement does not cause the statement to exceed the limit for the operating system command line
Your parameter list for a call report statement:
Does not cause the statement to exceed the limit for the operating system command line
Contains only quoted strings that conform to your operating system rules for quotes on command lines
Contains no unquoted dates
Form field names match correctly for queries or forms that you pass as parameters