Error code 154 in CCR

Hi Experts,

Good day!

I have this issue when running CCR. I am seeing Missing in R/3 with External Key Error code 154 when I run delta report. (Order with external no. XXXXXXX (material XXXX, plant XXXX) only exists in APO.

This happens when the production order is confirmed/declared in R3 and the changes do not come to APO instantly, when we manually delete it in APO through the CCR the production order then disappears from APO.

Do you have an idea what is the main cause why this type of error appears?

Is it normal? Ideally all changes in R/3 should be sent to APO automatically right?

Thanks a lot for your inputs!

Kris