Message type: E = Error
Message class:  CNV20305 - Messages for conversion packages in CO 
Message number: 059
Message text: BT &1 must be included in CoAr &2
For business transaction (BT) &V1&, no number range interval is defined
in reference controlling area &V2&.
However this BT is used in the controlling areas which are to be
merged.
If the BT is used with the same number range interval in all
controlling areas which are to be merged, there is no problem, because
during the conversion this number range interval is transferred to the
reference controlling area.
In the given case, however, the controlling areas which are to be
merged have different number range intervals, so that an automatic
transfer is not possible. Consequently, an entry for this BT in the
reference controlling area is required.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Maintain the BT in the reference controlling area and re-start the
programs for number ranges in this phase.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message CNV20305059 typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that a specific business transaction (BT) must be included in a corresponding configuration area (CoAr).
Cause: The error message CNV20305059 arises when there is a mismatch or missing configuration in the data migration process. Specifically, it suggests that a required business transaction (denoted as &1) is not included in the specified configuration area (denoted as &2). This can happen due to: Incomplete Configuration: The configuration for the business transaction may not have been set up correctly in the target system. Data Mapping Issues: The mapping of data from the source system to the target system may not include the necessary business transaction. Missing Customization: If the business transaction is custom or specific to your organization, it may not have been included in the standard migration templates.
Solution: To resolve this
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
CNV20305058 CoAr &1 was unnecessarily included in number range table CNV_NRIV_O.
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20305057 Number range table CNV_NRIV is not yet filled. CANCELLATION!
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20305060 In no.rg. &2 of target CoARr &1, documents &3 are from CoAr &4
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
CNV20305061 Number range &2 in target CoAr &1 overflows and needs to be extended.
What causes this issue?  Number range &V2& of target controlling area &V1& is defined as &V4&. This interval is too small for ...
Click on this link to search all SAP messages.