Can't get P6 to assign Baseline dates

Hi folks,

I searched the forums for an answer to this and couldn't find anything hence the new post.

I have multiple programmes, A baseline and monthly updates. 

I have assigned the monthly update of March as a baseline to the April update, (reason being i want to show alippage against previous month rather than against baseline)

I have added the baseline as usual using the 'maintain' function then assigned as Primary baseline, problem is though that the planned dates (BL1) aren't showing as the dates that i can see when i look at the March programme, i think its taking the dates from the original Baseline somehow.

 

Anybody any ideas?

 

Thanks in advance