Essbase cubes with different levels of detail - OBIEE 10.1.3.4.1 on LINUX

Hi all,
I have BSO and ASO cubes which contain broadly the same information, but with the ASO cube at much higher detail. For simplicity sake, they only have 1 dimension, and 1 fact. The dimension a date and is structured like:
Gen2 = year
Gen3 = year & quarter
Gen4 = year & month
Gen5 = year, month & day
Only the ASO cube has Gen5. the BSO cube only has the information to Gen4 level.
I've imported them both into the RPD and dragged the ASO cube across into the BMM. and then taken the fact column from the BSO cube and dropped it onto the BMM, selected its new source ( the BSO cube ) and set the
Content tab and set the logical level as Gen4.
I then dragged the key items from the BSO date hierachy onto the date dimension in the BMM.
I purposely had a slightly different date hierachy and data content in the 2 cubes so I could tell where it was getting the data from.
If I select the year only...it gets the value from the BSO, and if I drill down to quarter and month it also gets the dates from the BSO cube.
If I select the data fact, it will switch to the ASO cube and retrieve the value from there.
Same applies if I select just the year - data comes in from the ASO cube.
So my question is this, how do I get it to select the data facts from the less detailed cube when the details is not required and only switch to the ASO cube when the extra detail is needed?
Thanks in advance for any assistance

Anyone have any thoughts on this?
Data fact with 2 sources, where source 1 & 2 have differing levels of detail, it always seems to take the data from the more detailed source

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