MRRL document posting reversal

Hello

How can we reverse FI document created through MRRL transaction.

FI document cannot be reversed reason being -Error-Invoice doc. 5105692828/2009 was created via evaluated receipt settlement ERS

GR material document cannot reversed reason being-Error-Deficit of PU IR quantity 1,456.000 CS

Not possible even to return the delivery to Vendor , Movement type 122

Thanks

Dinabandhu