Can delivery date be met? (Realistic delivery date: &)

What causes this issue?

The date is the delivery date taking into account the
<GL:planned_delivery_time>planned delivery time</> in the
<GL:material_master_record>material master record</> or
<GL:purchasing_info_record>purchasing info record</>.

How to fix this error?

INCLUDE NA_T160M LANGUAGE EN
You can change the delivery date entered and enter the realistic
delivery date &V1&.

Error message extract from SAP system. Copyright SAP SE.