Order settlement to asset

Hi all

In one of my scenario we need to settle the costs collected in the particular order type to the asset .

In the settlement profile we have given FXA (Asset)in default object type and separate allocation structure .

In the allocation structure we have given different assignments like labour, service and material etc and for each of them settlement cost element is given as FXA( asset).

After settling the order all the costs except labour are settled, but labour costs remains in order

Please suggest me

Thanks in advance

Gangadhar