Im trying to save the operation result in my admin.py and i have this error:

quantize result has too many digits for current context

....
def save_model(self, request, obj, form, change):

    usuario_libra   = obj.consignee.membresia.libra
    valores         = Valores.objects.get(pk=1)
    vtasa           = valores.tasa
    vaduana         = valores.aduana
    vgestion        = valores.gestion
    vfee            = valores.fee
    vcombustible    = valores.combustible

    trans_aereo     = obj.peso * usuario_libra * vtasa
    aduana          = (obj.peso * vaduana )*vtasa
    fee_airpot      = (obj.peso * vfee)*vtasa
    combustible     = (obj.peso * vcombustible)*vtasa
    itbis           = (trans_aereo+vgestion)*Decimal(0.16)
    total           = trans_aereo + vgestion + aduana + fee_airpot + combustible + itbis

    if not obj.id:
        obj.total = total
        ...

What this mean?, all my model fields are Decimal Any help please

Thank you

django django-models django-admin
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