Creating Negative Revenue Entries

Hi,

A User needs to create negative revenue entries on 3 Projects, All are cost event projects which won’t allow the User to manually create negative revenue amounts, when they try and do this the system automatically just recreates the revenue (or more) due to the rev/cost budgets and actual spend. I need to create the negative revenue amounts so that the budgets can be corrected on the projects, this currently can’t be done as the revenue generated to date is higher than the budget needs to be lowered to:

User needs to generate negative revenue of £8363.65 so that the budgets can be corrected (lower than they currently are) so that the correct revenue will be generated to clear the UBR/UER.