Field help (IME1)

Each open item in the contract can be invoiced separately or grouped with other open items and/or other contracts.
This grouping is done according to the invoicing method, which can take the following values:

• Single open item 
  No open item grouping is performed.
  When open items are invoiced gradually, this invoicing method is the same as the "1 invoice/open item" method.
  When there are open items with late invoicing for a contract, only the 1st open item (the oldest one) remaining to be invoiced is processed. The remaining open items are not invoiced during this processing. Therefore ,the processing needs to be relaunched for each open item that remains to be invoiced. If not, there will remain open items with late invoicing for the contract.
   
• 1 invoice/open item. 
  No grouping of open item is performed.
  When open items are gradually invoiced, this invoicing method is the same as the "Single open item" method. 
  Each open item on the contract is the object of an invoice. Thus, when there are open items with late invoicing for a contract, all the open items are invoiced during this processing. On processing completion, it is therefore not possible to still have open items with late invoicing on a contract. 
   
• 1 invoice / contract  
  Each contract is individually invoiced. All the open items in this contract are grouped on the same invoice.
   
• 1 invoice / customer 
  Maximum grouping. All the contracts (and thus all the open items associated with the contracts) for a customer are found in the same invoice.

The grouping also depends on the following homogeneity conditions (if one of these is not common, there will be no grouping) :