Budget exceeded

Hello,

I am not familiar PS and IM module,can anyone help me resolve below problem?

We using transaction MIRO at order number xxxxx and the amount is SEK 150000.

For the time begining we raised the budget manually with SEK 10000 so they could post the invoice.

But if you look at for example transaction CJ31 -> Extra's -> Availability Control -> Analysis for this project, a credit note was posted of SEK 47780.

But when calculating the total value of 'Assigned' it's doesn't take in account that it's a credit amount instead of a debit amount, and therefore we get the message 'Budget exceeded' when posting an invoice.

Hope I can get help from you.

Thanks and regards,

Maria