Quantity overflow; & is larger than 9,999,999,999.999

What causes this issue?

A value has been calculated or manually entered that is too large to
store within the system. A quantity cannot be larger than ten digits to
the left of the decimal place and three places to the right of the
decimal.

How to fix this error?

Use a larger unit of measure, or split the quantity into two or more
items, that is, use barrels instead of gallons, or cubic meter instead
of liter .

Error message extract from SAP system. Copyright SAP SE.