When enabled in the Tm1p.ini file, the DisableWritebackOnTM1Formula parameter prevents writeback to the TM1® server when you enter a value in a cell containing a TM1 worksheet formula.
When you set DisableWritebackOnTM1Formula=T in the Tm1p.ini file, entering a value in any worksheet cell containing a TM1 formula that writes to the TM1 server results in the TM1 formula being overwritten.
TM1 formulas that write to the server include DBR, DBRW, DBRA, DBS, DBSA, DBSS, and DBSW.
Setting DisableWritebackOnTM1Formula=T also restores multiple level undo/redo and multiple copy/paste operations in a worksheet containing TM1 formulas.