In Crystal Reports 2008, Crystal Reports XI, and Crystal Reports 10, a custom User Function Library (UFL) is created. This is called CRufltest.dll. The DLL has one function, MyFunction ( ).
The function is declared as public. The DLL is registered and is in the same directory as U2lcom.dll. However, the function does not appear in the Formula Editor.
This behavior occurs because the data type is not declared as a supported type.
The function was declared as follows:
Public Function MyFunction( )
Since the return type is not defined in the declaration,
Microsoft Visual Basic assigns it the variant data
type by default. The Crystal Reports Formula Editor does not
support the variant data type.
To resolve the behavior, declare the function using a specific and supported data type. The following are supported data types:
Declare the custom function using a return type. For example:
Public Function MyFunction( ) As String
Once the data type is declared properly, the DLL is recompiled
and placed in the same directory as U2lcom.dll.
The function then appears in the Formula Editor under
SCRCOM, U2LCOM.DLL, Custom Function, UFL User Defined Function Library Formula Data Type , c2001961 , KBA , BI-RA-CR , Crystal Reports designer or Business View Manager , Problem