While trying to help Wendy find her Adam/s family in Aberdeen a search for a marriage between William Adam and Ann Clark showed a submission on the IGI but no extract.
However, it appears on Scotland's People.
I know I've probably read an explanation for this before but .....................?
I've had a look at the OPR page. There are four marriages on that page. The other three all appear on the online IGI. It looks like William Adam's marriage to Ann Clark was simply missed out on the IGI.
Even trying various searches within batch M111686 produces no likely results for mistranscribed names.