Fine-tuning of 9d7d618220e27024321a75be0058db2289115af2
Although the mentioned commit delays the consumption of a sequence
number at creation, it has the drawback to not generate one if the user
modifies the name.
In practice, we still want to generate a RMA number even if there is a
custom name. A good balance is to generate the RMA number if the user
leaves the `/` at the beginning of the name. If the user removes the
`/`, we don't generate the RMA number.
opw-2301412
closesodoo/odoo#57932
X-original-commit: 2ad9b4b2b5780c20a0cd77c48b24dcb76d69f912
Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>