Failed to send the previous invoice hash (PIH)

XML and business rules
1

For our first 2 invoices, our system failed to send the previous hash (which is fine for the first invoice, but the second invoice should have had First invoice hash sent along).
From 3rd invoice onwards we have been attaching the PIH. so technically our second invoice went in without a previous invoice hash. so what should we do about it now? can we ignore that case?

2

Dear @thanikkal

Please note that the PIH for the first sent invoice from the EGS must be a “0” value encoded to base64. This sequence is associated with each device/PCISID onboarded, and after that, it will be the previous hash of the latest submitted invoice, whatever the type of invoice sent when using the same device.

Thanks