You can change it in the system configuration parameters,

Settings > Technical > Parameters > Configuration Parameters

There look for the property_account_receivable parameter. You will need to have access to the technical features permission in your account.

Another way is to do that in the Product Category form or the product form itself,

It was very helpfull but i still have problems.

It was in fact this parameter I have to change: property_account_income_categ Field = income account Resource = blank acount.acount = 200000 Product Sales

I would like to have one more property_account_income_categ Field = income account Resource = Partner; New company acount.acount = 200100 Product Sales EU

If I create a new invoice to "New Company" it will still be posted at account 200000 and not 200100

What am I doing wrong