Why am I getting a validation error when I try to save custom fields?

Environment:

Oracle B2C Service all versions

Issue:

When saving custom fields, an error is received:  Only 9 Custom Fields can be Indexed per table.

Resolution:

This error is being returned due to the 9 custom fields per table indexing limit and it would be expected for it to happen.

As the error message informs us, we're allowed to index 9 custom fields for any given table at a time. Once we try to index a 10th field, this error will show up.

If you would still like to deploy the field, you can uncheck the 'Indexed' checkbox that can be found under the column name.