Newbie question: error creating service

[Jos Geluk <..hidden..>]

I have only just installed LedgerSMB, have customized the COA but got 
stuck at defining services. I have worked through many of the mailing 
lists and other supplied material, but have not managed to find an 
answer to my problem. I can create goods (but I don't sell any) but when 
I try to create a service and click "Add Service", I get this error:

Cannot create Service; Income account does not exist!

I have not removed any accounts. Under the Dutch standard I would book 
income on account 8520, ("Sales results A"). This account is present. 
When I define a "Good" it is even pre-selected as the income account. 
Why doesn't this work with a service?

Apologies if this is all too obvious. There must be a step that I have 
skipped, but I can't seem to find it. Please help.

Thanks,

Jos Geluk.

--
Ardis Park Music
tel. 06 5341 4670