On which date should we enter the invoice made out on 2018 of an export scheduled in 2019?

We have an export business in 2018. Customs clearance of this export will be in 2019. Which date should I enter this invoice?

2- As I’m liable for E-fatura and E-defter, will I have a problem in 2019?

1- 2019

2- We think there will be no problem.

Source: İSMMMO
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