ok,
Try this..
go to C:\Program Files\Ubisoft\Silent Hunter 4 Wolves of the Pacific\Data\UPCData\UPCCampaignData
Find: PatrolObjectives.cfg
Open it.
Find the lines
FileName=data/Campaigns/Campaign/PatrolObjectives/Photo Java Sea 01/Photo Java Sea 01.mis
StartDate=19411201 <-- Change this date to a later one like 19420301
EndDate=19440301
GameModes=Career
InclusionProbability=10
MinimumDifficultyRating=0
MinimumPlayerRating=-3
ExclusiveLayer=No
ExclusiveLayerID=1
EvaluationReason=FirstObjective
AllMatch=Java Sea
ObjectiveType=4
BriefingMapName=NULL
BriefingMapIcon=NULL
BriefingMapIconPosX=0
That should fix it... I have changed my file as above, thanks for finding this buglet...