permanent lock in RFC call

Hi,

in my scenario I want substitute TELNET RF Application with RFC CALL to Web Services Systems.

I have a problem with LOCK:

in TELNET I have standard table that I lock first time and I continue for the use of TELNET Application,

now I lost my lock every time I do a new call to the system so standard table (es. LIKP AUFK) are not locked.

How can I resolve my problem?

Thanks