Basically...YES.
I say basically because there are a lot of reasons someone would change a FPL. Either being an FBO that is correcting a FPL for a crew, a National Authority if not complying with some really specific regulation, a spanish cancelling FPLīs that donīt comply with THEIR requisites...(
)
Basically (again...) if you change someoneīs FPL there are a couple of considerations you should take into account:
1-You should NEVER change a FPL that has not been either originated/filed by your station (also because in loss of comms, the crew will fly the route that they have on THEIR FPL thus causing a serious safety problem īcause ATC are counting on the crew flying the routing they have on their system);
2-Not professional and not respectfull;
3-If you like not getting paid by doing someone elseīs job...
;
4-That is why staff on IFPS call themselves the originators in order to change the routing/FL on a FPL that has gone to manual processing due some error...
Cheers,
C_H