koetjes,
If you accept the premise that PPES displays the figures with the Transformer settings for each measure, then the only way to change the report is to change the cube, which requires you to change the model.
Unless you think other users of the cube will complain, you'll need to change the decimal places in the model to 0 and then update the cube (no need to rebuild).
A workround could be to have the budget figures in the model twice, once with 0 d.p. and once with 3 d.p.; the report writer can then choose the best measure for the report.
so:
Change the report? No effect
Change the cube? Has effect, but other reports (and users) will be affected.
Other options?
-Duplicate the measure
-Badger Cognos to add functionality
soi la, soi carré