Hello,
In our project, I create 40 custom fields in Sales Document Item. Also, 40 custom fields in Sales Document Billing Item. The total number of characters in Sales Document item is 764, in Billing Document Item is 772.
According to the SAP note linked below; system quota is 1700 characters.

https://apps.support.sap.com/sap/support/knowledge/public/en/2824028
So, according to this information, normally I have to fill the %45 of the quota in Billing Document Item. But when I am creating a new custom field, it seems that I have filled %81 of it. Do you have any experience about this problem?
Best Regards,
Asli