I am new to Oracle Contracts. We are loading Contract lines to oracle using Concurrent requests. The problem is user has loaded lines for say Tuesday for the months Feb-Jul. and they were loaded successfully. On Wednesday she tried to load lines for another 2 months Jun-Jul but was unsuccessful. On Thursday she loaded the same files Jun and Jul separately and they were loaded successfully. Now the issue is why were the lines not loaded on Wednesday and throws the error "Coverage Line record could not be created: Line Start Date is not during contract effectivity. Please enter a valid date. :1 Coverage for Site with covered id XXX for contract number XYZ did not get created due to Coverage Line API error" for all the lines tried to load. This happened only for the Jun Lines. July lines were loaded successfully. I have checked the log file and the data file all the lines were ok and there is no change in date format, no spaces, no commas.