whne you selected update baseline what options did you choose there are many options. Make sure that under maintian baseline that you are pointing to the correct baseline. Same for assign baseline. 

Hi Sarah,

I agree with the others here and tend not to use the baseline update function as you never quite know what its going to do.

Your best course of action (or what I would do) is to:

delete first updated baseline attempt

re-export baseline

Copy / Paste again

Re-import original

Open copy & manually update the dates to the required activities (making sure your logic doesn't affect the dates of activities that you want to remain constant) 

Import baseline

Assign baseline as required (Project / Primary / Secondary or wherever!)

You probably know all this already but hope it helps

Good luck

Neil

Hi Sarah

I have the same experience. Updating a baseline by selecting activities is not working correctly in P6. I have tried series of filters for selected activities, individual activities and in the most cases it did not work. In some, with updating only for resources it worked occasional. I have noted this issue with our Primavera seller but the issue is not resolved. So, i do not use this feature anymore. I note that P. Harris ones commented , that is what i remember, the the best way to wreck a schedule is to use the baseline update funtion.

Regards Johannes

Jane,

Another possibility is that you were not actually looking at the updated baseline.  You not only have to attach the baseline, you also need to assign them to one of the available slots (Project/Assign).  Finally, confirm that you are looking at the correct, ‘slot’.  Good luck!