Project for the Web - % complete calc error

Hi, it appears that be the order in which the effort/duration etc. fields are entered/edited, changes the calculation from % of effort completed to a % of time elapsed.

When entering a new task, typically I enter those details in the order:

Task name

Start

Finish

(accept the calculated duration)

Assign a resource

Effort (overwriting the calculated effort - typically my resources will only work part-time on project work e.g. 4 days of effort may require 4 weeks duration)

Effort completed (amend as needed)

Effort remaining (accept the calculated value)

% complete (accept the calculated value)

..this works fine - regardless of the start/finish (calculated duration), if I set:

effort of 100 days

update effort completed to 50 days

effort remaining will be 50 days

% complete will be 50%

However, if I then change the start or finish date – at this point the % complete calc changes to an unknown calculation which is neither % of effort or elapsed time. Even when putting the fields back to their original values, % complete doesn’t return to original value?!