Calling functions

[cottonstalk]

What is the correct syntax for this code:?

update gvsuowner.wbrde po a
set a.wbrdepo_pidm = f_get_pidm (UPPER (a.WBRDEPO_STU_ ID));

Error at line 1
ORA-00904: "F_GET_PIDM ": invalid identifier

[debasisdas]

can you please specify what the function F_GET_PIDM does.