General parameters > Chapter Common Data > Parameter SIVSUP (Delete invoices) 

Use this parameter to authorize or prohibit the deletion of customer Invoices (GESSIH) in the Sales module or Customer BP invoices (GESBIC) in the A/P-A/R accounting module.

Yes - You can delete a customer invoice as long as it has not yet been validated or posted.

No - You cannot delete customer invoices.

Level of localization/Global variable

This parameter is defined at the level Site.It belongs to Chapter TC (Common Data) and the Group INV (Invoicing rules),The following parameters are also associated with this chapter and group :

The global variable GSIVSUP is associated with it.

Functions concerned

The following functions are associated with this parameter :

 A/P-A/R accounting > Invoicing > Customer BP invoices

 A/P-A/R accounting > Invoicing > Customer intercompany invoice

 Sales > Invoices > Invoices