Need to change Charge Account on PO Distribution lines

As part of re-organization, business is changing the project organizations at project level in oracle projects using mass update functionality. Based on the above change, Charge account relating to open PO on which partial receipt was applied has to be changed to accommodate the expenditure org change.

What is the option to ‘change’ the ‘expenditure organization’ at PO line level for unbilled/unreceipted quantity of PO, when project organization is changed?

Example: Project No. 1234 was created in OU-1 with organization OU1-PQRS. A PO No. 890 was created with 100 quantity against this project in OU1.

Hence Charge account was generated with EXP ORG ‘OU1-PQRS’.