Quantity in PO unit of measure is zero -> No tolerance checks possible

What causes this issue?

The system has converted the quantity entered in the
<DS:GLOS.3526BFE6AFAB52B9E10000009B38F974>unit of entry</>
into the
<DS:GLOS.3526C0C9AFAB52B9E10000009B38F974>order unit</>. The result of
the conversion is a quantity lower than 0,001. As it is only possible to
have three decimal places for a quantity, a smaller quantity
(such as 0,0003) is interpreted by the system as 0,000.
The quantity in the order unit cannot therefore be used for the
tolerance check for the quantity entered in the
<DS:GLOS.3526C0CDAFAB52B9E10000009B38F974>purchase order price unit</>.

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

You have entered a quantity manually in the purchase order price unit.
A quantity
in the purchase order price unit of 0,000 is therefore not allowed.
The system cannot post the document.

How to fix this error?

Check the quantity in the unit of entry. Enter the quantity (not smaller
than 0,001) directly in the order unit and enter the order unit as the
unit of entry.
If the quantity entered is correct, check the conversion factor defined
in the material master record.
If this is also correct, this means that units of measure defined
in the material master record are unsuitable for Inventory
Management.
INCLUDE NA_SYSTEMVERWALTUNG OBJECT DOKU ID TX LANGUAGE EN

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.