Account determination not possible

Hi Friends,

I am trying to asign material to network activity but could not do that and getting eror message

Account determination for entry INT BSX not possible

Message no. M8147

Diagnosis

The system did not find an account for this transaction. This means that

the account determination for key INT BSX is not maintained in MM

Customizing (Valuation). The key is made up of:

o Chart of account

o Transaction key (= Posting transaction)

o Valuation grouping code

o Account grouping code

o Valuation class

Any pointers

Thanks

Ashu