Date not working on caliber 1001.

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I have a Omega Constallation with a caliber 1001.
It runs smooth, and have had service a few years ago.

however, the date has stopped changing on normal working mode.
The quick set works as i should, but when changing the date by tuning the time, it "jumps" back to the date is was.

as far as as I can gather, it is either the "Date indicator driwing wheel" (part 1560) og the "Change date" (part 1562)
I have to change.
Marked in the image. (Not my caliber in the picture. My watch is not been opened yet)

I hope someone can confirm that it's the right parts I have have to find.

Thx in advance for any help.
Dennis.
 
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Let your watchmaker do the proper diagnosis.