In customer account statement is not visible the document date, but only posting date of invoice. 

For the customer what is relevant is document date and mainly when you migrate from a previous system the AR open items they posting date which is the one of the period of migration,

This is a big issue as customer needs to pay reading customer statement and if they see posting date they do not understand and delay payments.

The suggestion is to make visible also document date.

I think this is a bug but Microsoft answer that customers want to see only posting date (how to manage migrated data?)