Alternative Item group not appearing CS11

Hi all,

We have created BOM with all the substitution materials which can be used at the time of Production.

We have utilised the Alternative item group for this. When i look at BOM for a material say X using CS03 i can see the Alternative Item group. But when i explode the BOM using CS11 i cannot see the alternative item group in it.

The scenario in details is :

For the header material X i have X1,as component with different change numbers and unique validity dates and this component is seen in 3 lines in BOM with alternative item groups against it.

Now when i explode the BOM using CS11 i can see X1 component with alternative group for only 2 line items.

We are in ECC6.0 version, can i ask you whether there is any patch or oss note to be applied.I have tried searching OSS notes but couldnt find them

Please advice as this is of very high importance.

Thanking you

Regards

Raj Kiran