If you place a member formula on a time or accounts dimension, it may be overwritten by a time balance calculation.
Table 79 shows an example in which Opening Inventory is tagged as First:
Because Opening Inventory is tagged as First, Essbase calculates Opening Inventory for Qtr1 by taking the Opening Inventory for Jan value. Any member formula that is placed on Qtr1 in the database outline is overwritten by this time balance calculation.