Batch Date vs ICU Sys Date


Hello Colleagues,

Would anyone know why document type AE has a Batch Date different to the ICU Sys Date in F0911?

I have an invoice ) raised with batch date same as ICU Sys date, the AE line has the same Batch Date as the RI, but ICU Sys Date is Different.
Can I assume correctly that the batch date on AE line is inherited from the batch header and the IC Sys Date is when the batch is actually posted?

Any help is much appreciated.