Northern Ireland OSS and VAT Returns

HI everybody, here's the scenario.

NI registered company selling online to EU countries, also registered to OSS Scheme.
The sales to individuals must be charged with customer's country VAT. I.E. Germany 19%.

This VAT need to be accounted separately and reported to the OSS Return (available on October 1 from HMRC) but at the same time needs to be stated in the invoice.
It is then paid separately to HMRC, according with the OSS filing.
How to manage this in order to have foreign VAT not included in the UK VAT RETURN and accounted twice?