The BOM for document & is not valid on &

What causes this issue?

You want to change or display the BOM for document &V1& and have
entered the date &V2& in the <LS>Valid from</> field.
However, you cannot process this BOM, as the BOM is not valid on this
date.

How to fix this error?

If you want to display the BOM over its entire validity period, proceed
as follows:
Choose <LS>Document BOM -> Display</>.
Enter the special character "!" as the beginning of the fields
<LS>Valid from </> and <LS>Valid to</>.

Error message extract from SAP system. Copyright SAP SE.