Problem separating exterier and screen door on slide-on camper

is it the type where you lift the handle to separate the two doors

Yes, the one on our caravan you lift the handle to separate the two doors and push down to open as usual.
Regards Andrew.

Hi Andrew,
I had this problem with a three lock door, I removed the two screws from the top and bottom locks on the door, this should allow you to seperate the doors. I found that the part of the lock between the two doors has a safetypin type spring catch, I removed this spring and with a pair of pliers put a slight bend in the wire/spring this allows the spring to clear the latch when when door handle mechanism is lifted . A little trial and error is required. At least this will give your somewhere to start from.
When reassembling do not over tighten the screws as you will destroy the latch and we paid over $30. for one early this year. they are quite fiddly things so a little patience is required
Hope this helps.
regards
Peter