Created attachment 2705 [details] odt file with screen capture of three steps to demonstrate (english version below) On crée un abonnement avec périodicité "trimestriel" et modèle de numérotation "seulement saisonnière" (première date de parution 01/10/2010). On choisit "hémisphère nord" et commence par "automne". On précise "retour à" : 4. en enregistre et on obtient : premier numéro "nothing 2010". ----- english('bad enough') : we create a subscription with frequency "quarter (seasonal)" and numbering pattern "seasonal only".first issue publication date = 01/10/2010 french format means : 2010, first of october. we choose "north hemispher" and begin "automn", "back to" :4. we manualy create the serial : it begin by "nothing 2010".
I can reproduce the problem on current master. I did not manage to create a working seasonal pattern and my first issue was created as 'nothing 0'.
Looking at the code 5 seasons are defined for both Hemispheres the extra being called 'nothing' North of the equator and '' south of it. I can't see any mechanism for skipping the bogus season so at present it just loops on to the next and wraps around to give you nonsense. Wondering if this has worked for anybody in the past
This has been fixed with the serials 'rewrite' in 3.14. There are still some bugs about the implementation of seasonal, but there is no 5th empty season, so closing this fixed.