Help common to the single and mass processes for the account posting change. This field is only displayed upon unitary processing. It is used to enter the quantity of operation units to create or created on the current period. This value can only be accessed if the following conditions are all met: 1/ The "update" flag is set to "Yes". 2/ The depreciation method is equal to "OPE" (Operation units). 3/ The fiscal year is sub-divided into periods. Note: the entered value added to the total of "period OPE" of the closed periods of the fiscal year cannot be superior to the number of "fiscal year OPE".