How to change Frame Rate from Imagesequence

Hello DaVinci Gurus,

It´s so nice - after the softwaretraining one can think, that you are prepared for a real world job - and the grading works well - but there are some little traps I have to take - that was no question so far.

I imported a OpenEXR Sequence wich was intended to be at 25 frames per second. But I don´t now why, DaVinci recognices that sequence as 24 frames. This is shown in the new Media Tag in Release 9 in the Metadata overview. And in the confirm tab I got the warning triangle, that there is a resolution conflict.
The OpenEXR are at 720p, the settings in the Master Project Settings are at 25fps in the Video monitoring format.

The option to calculate timecode is greyed out and set at 24fps...

This issue is also in the deliver tab relevant. I can´t render a quicktime mov at 25 fps, only at 24 or at 23.98.

So I´m sure that there is a easy solution for this.

Thanks a lot - again :)