End-on-end not permitted. ?
 

Does anybody using this forum understand the precise rules behind the fare restriction "END-ON-END NOT PERMITTED" ?
I'm in Kuala Lumpur now, flew here on a round-trip KLM flight from AMS .
I'd like to go to Jakarta for a couple of days before heading back to AMS. I see that KLM have staggeringly-cheap fares KUL-JKT $68 round-trip all-in.
I was poised to book one of them today but I read in the fare rules (in the AMS-KUL ticket that I'm part way through using and also the KUL-JKT cheap tickets ) that END-ON-END NOT PERMITTED.
I understand the basic concept behind that restriction but is there a time element involved ?
For example; if I were to fly to a ciity and then 5 months later ( before heading back home ) took another KLM flight. Would I be in breach of the fare rules.
I can find no exact explanation of this anywhere.

Please could somebody provide a definitive answer?

Many airlines allow their tickets to be combined in various ways. One of those is end-on-end which means that you for example fly NYC-LON on AA using fare X and then continue on OK to PRG using fare Y, all on the same ticket. KLM's fares are notorious in that they do not allow this.

In your case you have nothing to worry about though. This rule only applies when you have more than one fare on the same ticket.