数据插入问题

insert into daystockBatch(goodsid,depotid,batchid,status,daytime,Beginstock,Goodsarrival,Goodsarrivalqa,goodsreturn,Stockin,Stockinqa,Samples,Stockerrors,Stockerrory,consignment,productreturn,productreturnqa,Draw,Drawreturn,movein,moveout,destroy,endstock) values ('c01','ZJ-04','050106','1','2005.02.23',15600,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,15600)
结果出现以下问题：
服务器: 消息 2627，级别 14，状态 1，行 1
Violation of PRIMARY KEY constraint 'PK_daystockbatch'. Cannot insert duplicate key in object 'daystockbatch'.
The statement has been terminated.
请问这是怎么回事？前几天还没有问题，今天就出问题了。