(Using IBO 4.5B)

Is it possible to define a lookup relationship using keylinks/keysource
between two ib_queries where one gets data from a stored procedure?
Something in this manner:

mainquery:
sql='select gl, sl, dramount, cramount from rp_tbsl(:period)';

lookupquery:
sql='select gl, description from accounts';
keylinks='accounts.gl=?????? // what goes here?
keysource=ib_datasource1

ib_datasource1:
dataset=mainquery;