Manually-entered quantity affects other quantities that were calculated

What causes this issue?

You have entered a manual quantity, and there are other quantities in
the same dimension that also have to be changed. The Quantity Conversion
Interface (QCI) does not contain a special check logic that compares
quantities with the same dimension.

System Response

This is a warning message; calculations will not be automatically
changed.

How to fix this error?

You should change the other quantities to match the manually-entered
quantity.
Example - You changed the quantity in kilograms but did not change the
quantity in tons. 1 ton = 1,000 kilograms.

Error message extract from SAP system. Copyright SAP SE.