Enabling creation of Summary Credit/Debit Notes
Support for Summary CR/DB’ field is added in the Configuration module under Pricing/Editing tab.

This flag will be false by default
‘Support for Summary CR/DB’ flag must be enabled
Select the ‘Support for Summary CR/DB’ field
A pop-up displays as shown below with “Yes” and No” options

If ‘Support for Summary CR/DB’ flag is disabled, Type field in the summary Invoice will be disabled.
Hence, user will not be able to create Summary Credit/Summary Debit memo manually.