Cannot Add Used DCs

Hi,

I created two SCs and 1st SC consists of 3 DCs:

1) External library

2) J2EE server library component

3) Web Module DC

The first one is for all the external libraries,the second one includes all the libraries from the first one as DC of type ext. library is not deployable and the third DC of type Web MOdule is to hold all the class files during run time.

Now in my second SC, i need to include some of this DCs, in the USed DC, but i cannot, it does not allows me to do so.

Any kind of help will be highly appreciated.

Thank You,

With Regards,

Krunal Rana.