Apologies that this not exactly equal, but when my wife came to Spain with me after we were married it was on a One Way as the visa was for 'family reunion' i.e. to settle in Spain with me.
There was a ‘funny’ situation thro. We first arrived in Europe at Frankfurt and, as I discovered later, that was where my wife should have ‘been admitted’ to Schengen Area. I was a bit stroppy with the official who started looking at my wife passport and told him we were in transit to Spain. He let us pass.
When we arrived in Malaga we just walked through, no immigration control, so I told a police officer that my wife had just arrived from Phil. He said we were just to go to our nearby police station the next day.
When we went there, they asked where the arrival stamp was. So back to Malaga, they said the stamp should have been done in Frankfurt and implied we should return there for it. I am a former UK police officer and for 15 years have been a voluntary translator at a police station in Spain, so I chatted around the problem and finally we got the stamp.