Condition record exists (removed manually)

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

This message tells you that the condition record exists but has not
been set in the document. If new pricing is carried out for the
document item, the condition would be set.
There can be different reasons why the condition has not been set:
The condition has been manually deleted from the item condition screen.
The condition record was created later. Here it should be noted, that
order processing and pricing have buffer mechanisms. This has the
effect that a newly added condition record is only found after you have
completely left order processing and called up the condition record
again.
When an item was added, other key fields were used to access the
condition record than the change time. This means that the conditional
check at the add and change times could have different results. This can
be seen when modifications are made.
In billing (or when copying orders): Certain condition types have not
been determined in the source document (This is generally controlled by
pricing requirements). When creating a document, you work with document
flow (TVCPF,TVCPA), using a pricing type, which does not redetermine
these condition types, although these should be retrieved using the
requirements.

Error message extract from SAP system. Copyright SAP SE.