Update:
My friend’s wife was in possession of a Schengen Area “REAGROUPACION FAMILLAR UE/EFE 90 day” visa. This means a visa to permit her to enter Spain for the purposes of joining her husband.
At MNL with her passport containing the visa and the CFO exit stamp, and a one way flight ticket, she had no problems with emigration.
She made transfers at Hong Kong, London Heathrow and Madrid.
At Madrid her passport was stamped showing entry into Spain (Schengen Area) and she travelled on to Malaga, her destination.
She now has 90 days in which to make the application for permanent residence status, a formality.
NOTE: The “REAGROUPACION FAMILLAR UE/EF” Visa is issued under the provisions of the Schengen Agreement. Previously the Spanish Consulate had issued a Tourist visa marked up to permit the residence application. This type of visa should ensure that there is no problem about needing a return ticket.
I hope this will prove of assistance.