A problem when using a data element in BAPI

Hi there,
I build a function module, and want to use it as a BAPI. But when I add the function module as a method of a BAPI object, it gives me the following error: data type xxxxx cannot be used for methods.
I guess the problem happens because of the type of data element I used for the input parameter of the function module. Thus I tried many other data elements, but I keep getting the same error. I am really out of the game. Could anyone tell me which data element I should use for the input parameter of the function module? The function module has only one input parameter, which should be a string with length less than 100.
Thank you so much!!
Sincerely,
Bing

The function module has only one input parameter, which should be a string with length less than 256. (I tried many predefined data element like RPLM_STRING, but when I tried to add the function module as a method of BAPI, the SAP always gave me the error: data type xxxxx cannot be used for methods)
It only has one output parameter: RETURN (associated type: BAPIRETURN)
I am really not familiar with ABAP program, let alone BAPIs. Any suggestions would be very helpful to me. I sincerely appreciate your help.
Bing

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