Ok It works. I forgot this parameter and yet I documented it in my French Ekos documentation!
Just one thing more, when I shot a preview, I have the message into the Capture tab " Setting rotation to X° E of N.." but not image is taken. The capture rounds in circle and in the end the capture is aborted. So next when I do again an astrometry the result is correct.

Thanks for all Jasem.

PS: Perhaps I am going to make a french Kstars planetarium documentation in addition to Ekos.

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