SAP Note 19076 - RFC Generator can't generate RFC example programs

Symptom:

The RFC Generator can't be started or the generation process is stopped

Cause and prerequisites

In certain cases the RFC Generator can't generate example programs

Solution
In the following cases the RFC Generator can't generate example programs:

Function module not remote callable
If the function module is not remote callable the menu items of the RFC Generator are disabled. Set the remote attribute in the administration data screen. Caution: Switching an existing function module from 'local' to 'remote' and calling this function module remotely may cause problems, because the function module has not been designed as remote callable!

Reference field/structure is missed
All function module parameters must have a reference field/structure that is defined in the data dictionary.

Structure or table parameter contains not supported data types
For external RFC programs within structures and tables there are only a certain set of data types allowed. Allowed data types are: CHAR, DATE, TIME, NUMC. All other data types are not allowed in the current R/3 releases: INT, FLOAT, PACKED etc.

That means, if there is a field in a structure or table detected that has a not-allowed data type the generation process is stopped with the appropriate error message.