Hi, I see a warning while solving and I don't really know where to start in finding the cause: Here is the debug output of the solver: INFO : [2012-09-07 14:56:21,969] Solving started: time spend (90), score (null), new best score (null), random seed (0). DEBUG: [2012-09-07 14:56:22,376]     Step index (0), time spend (499), score (0hard/99soft), initialized planning entity (Inspection of 112474.I#0 -1934359865). DEBUG: [2012-09-07 14:56:22,704]     Step index (1), time spend (827), score (0hard/198soft), initialized planning entity (Inspection of 112474.I#1 -1934359864). DEBUG: [2012-09-07 14:56:22,990]     Step index (2), time spend (1113), score (0hard/297soft), initialized planning entity (Inspection of 112474.I#2 -1934359863). DEBUG: [2012-09-07 14:56:30,166]     Step index (260), time spend (8289), score (0hard/24974soft), initialized planning entity (Inspection of 61457.I#0 1155198787). DEBUG: [2012-09-07 14:56:30,189]     Step index (261), time spend (8312), score (0hard/25049soft), initialized planning entity (Inspection of 61457.I#1 1155198788). DEBUG: [2012-09-07 14:56:30,210]     Step index (262), time spend (8333), score (0hard/25148soft), initialized planning entity (Inspection of 46045.I#0 1313733879). DEBUG: [2012-09-07 14:56:30,234]     Step index (263), time spend (8357), score (-1hard/25223soft), initialized planning entity (Inspection of 46045.I#1 1313733880). DEBUG: [2012-09-07 14:56:30,255]     Step index (264), time spend (8378), score (-1hard/25298soft), initialized planning entity (Inspection of 23226.I#0 1418884381). DEBUG: [2012-09-07 14:56:30,281]     Step index (265), time spend (8403), score (-1hard/25373soft), initialized planning entity (Inspection of 23226.I#1 1418884382). DEBUG: [2012-09-07 14:56:31,672]     Step index (321), time spend (9795), score (-15hard/28951soft), initialized planning entity (Inspection of 8748.I#1 1923067852). DEBUG: [2012-09-07 14:56:31,703]     Step index (322), time spend (9826), score (-15hard/29026soft), initialized planning entity (Inspection of 124206.I#0 2065209261). DEBUG: [2012-09-07 14:56:31,719]     Step index (323), time spend (9842), score (-15hard/29101soft), initialized planning entity (Inspection of 124206.I#1 2065209262). INFO : [2012-09-07 14:56:31,719] Phase constructionHeuristic ended: step total (324), time spend (9842), best score (-15hard/29101soft). WARN : [2012-09-07 14:56:40,252]     Cancelled step index (0), time spend (18375): there is no doable move. Terminating phase early. INFO : [2012-09-07 14:56:40,252] Phase localSearch ended: step total (0), time spend (18375), best score (-15hard/29101soft). INFO : [2012-09-07 14:56:40,252] Solving ended: time spend (18375), best score (-15hard/29101soft), average calculate count per second (20824). I know I give little details b ut I don't know what is relevant. If someone can point me into some direction I can search and provide more info. Thanks a lot! Michiel   ----------------- http://www.codessentials.com - Your essential software, for free! Follow us at http://twitter.com/#!/Codessentials