Modify an invoice changing the following:
| Title | Item description | 
| VAT rate % | Item VAT rate; rate from Invoicing Settings General, ID dph is set by default. | 
| Unit type | Type of unit, e.g. hour, pcs. | 
| Count of piece | Number of item units | 
| Price/Unit excl. VAT | Price per item excl. VAT The system will calculate the next 3 fields automatically. | 
| Accounting codes | Application of items for needs of double-entry bookkeeping. Set it up in Invoicing Settings Accounting. | 
| Reverse charge | |
| Other items on invoice | Use + or - to add / delete invoice items. | 
| Addition | Optional description | 
