Not posting to all accounts on Invoice

[Jaeger]

Having created and invoice with 2 service items on,
1 is labour supplied
1 is materials supplied.

The invoice is posting all entries to labour supplied account and zero to materials supplied.

Each item in products has it's own default sales account to post to, strange it's not posting each to the correct nominal?

They are in the group 7000 - income

Coded as
7010 - labour supplied
7020 - materials supplied