I use the time lines in reporting and forecasting. Three statements are generated, and income statement, balance sheet, and cash flow. I import data in to cubes from oracle. The item dimension has MTD imported and YTD is calculated.
Recursive time is used for this calculation (month[first] .. month[this]) This technique works within a matrix (ie income statement). The cash flow uses data from different matrices (mostly balance sheet). [First] aggregates from the beginning of time not within a year.
If your model is connected to a database and you’re using v5, the timelines will always throw an error when model is updated. This is a known issues which Quantrix guys are working on. I have developed one of my model from scratch using v4.1 to get my timeline functionality working fine.
However if your are not connected to a database, l think it should be working fine. Kindly give more details.
I hope this helps.