Settings for subledger transfer are not consistent

What causes this issue?

The settings for transfer to another subledger differ. The document
cannot be posted.
The document contains an item on contract account &V1& for which a
subledger has been entered. This item contains transaction &V2&, for
which no subledger has been specified.
If a subledger for transferring the postings is specified for a contract
account, a subledger must be specified in the subtransaction for <ZH>all
</> postings to this contract account.
For <ZH>one</> contract account, there cannot be postings both <ZH>with
</> and <ZH>without</> target subledger.
Since a document can only be transferred in full with all items and the
settings for transfer have to be identical for all items, it is not
possible for the document to be posted in this state.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.