Solution : https://service.sap.com/sap/support/notes/604999 (SAP Service marketplace login required)
Summary :
In the SAP MIR6 transaction when an invoice document is called, errors might occur if the invoice has been evaluated incorrectly in the background or posted via EDI with an 'Incorrect' status. Modifying the item-level amount can trigger an error when exceeded amounts surpass the set tolerance for price variance ('PP' key in OMR6). However, the invoice can still be posted despite this error. This glitch is attributed to a programming flaw corrected by the designated support packages for versions 4.6C and 4.70.
Key words :
invoice quantity net purchase order price, system generates error message m8082 'price, transaction 'overview invoices', tolerance key 'pp', price variance, invoice document, system determines, message log, program error, transaction omr6
Related Notes :
496839 | MIR7:message M8082 as an error message prevents saving |