Creating new infostructure for Product allocation

While generating new infostructure for allocation in MC21,I am getting warning message as below

"The domain for field ProdAllocQty has the output attribute 'Without +/- Sign'

Message no. M!077

Diagnosis

Field &1 is of internal category P, F, or I, meaning that it can also have a negative value. However, the domain used has the output attribute 'Without +/- Sign', meaning that negative values are displayed in the standard analysis without a + or - sign (i.e. as 'positive').

Procedure

To define the info structure, use a field whose domain has the output attribute 'With +/- Sign'.

Please help me to resolve this.