A subscription is based on a Virtuozzo Container type hosting plan that has a non-zero Number of databases (numdbs) included. Can the subscription hosting plan be changed to a hosting plan with Number of databases (numdbs) included amount set as "0 of 0 database(s)"?
That is not possible at present, the only workaround is to modify numdbs in the target plan to be compliant with the source one.
An alternative solution is to drop databases of the Container in question.
WARNING Please make sure that the databases do not contain any valuable data prior to deleting them.
There is a feature request PBAS-20526 to make the number of databases billable resources to be unlimited or unmanaged. It will be implemented in future OBAS releases.
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Knowledge base, each product update comes with corresponding KB article.