Forecasting BMA Curve Issuer

Key Forecasting BMA Curve Issuer in Model[BMA Swap] refers to the Issuer that identifies the yield curve to be used for calculating the forward BMA rates associated with the BMA leg.
If left unspecified, the riskless yield curve used for discounting is being deployed for BMA rate forecasting as well.
Expects an object of type Issuer.
See also notes in Model[BMA Swap]