Hello, I have a customer that gets this error when they run the planning worksheet. The error is caused by close to 100 items and it only happens once or twice every few weeks then goes away. We think it could maybe be a circular reference, a calendar problem, or planning parameters that cause this error, but we're not sure. Has anyone ran into a similar issue before? The customer creates a lot of production orders and assembly orders, when the planning worksheet runs correctly it's about 900 lines give or take.