Rolling up percent Complete

Hi,

I Have set a project up in P6.7 I used the Physical % complete and Performance % Complete and set the WBS to Activity % Complete, Assigned a material resource with a value of R1 and it rolled up the percentage perfectly.

I have imported the project againand all the settings are still there , but the percent is not rolling up?

What have i missed, I went through the process step by step and am not finding what may have changed?

Thank you