If there is, it will be included in the account of "main business income", if not, it will be included in the account of "other business income".
If the installation costs have not yet been received, but have been invoiced in the tax office,
Borrow: Accounts Receivable - XX Company? XXXX yuan
credit: major business income XXXX yuan
or
borrow: other receivables-XX company XXXX yuan
credit: other business income XXXX yuan