document flow of copied document reflected in refernced orders

Hi All,

I'm seeing a situation in the system where FOC(Z type) orders, when created with a reference, the original document's document flow is showing up deliveries created from reference order.

i.e, if A2 is created using A1 as reference and then when A2 is delivered the delivery is showing up in A1 document flow as well and this is specific to this order type only, standard orders(z type) are working fine.

Can you point me to what config can lead to this?

Thanks.