I read somewhere that the EC was going to allow back to back ticketing, however I never saw any final approval.

Here's my scenario: I need to fly 2 round trips, each for one day to the same destination. If I buy nested tickets, it is almost 200 Euros cheaper.

For example:

AMS->MUC December 11th - Ticket A ------------------
MUC->AMS December 12th - Ticket B --- |
| Nested |
| |
AMS-MUC December 22nd - Ticket B ---- |
MUC->AMS December 23rd - Ticket A --------------------

is cheaper than 2 tickets AMS<-MUC->AMS.

Is this illegal on KLM, or perfectly OK? I intend to fly all segments, and will have connecting flights to / from AMS on KLM paid on separate ticket by my employer.

Thanks