I wouldn't have thought so either, after all, they are to help support your children, not the same as a normal debt.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk
Child support agency debts are exempted from both IVA and bankruptcy proceedings, so any ongoing payment arrangements you have with that creditor would need to be taken into consideration in working out your disposable income.
How much do you owe to the CSA, and how much are you currently paying back on a monthly basis?