Halliday & Matthiessen (1999: 114):
Grammatically the distinction between propositions and proposals is constructed as follows. When the projection is reported, propositions are realised by finite bound clauses, i.e. clauses that select for primary tense or modality; and proposals are realised by irrealis (infinitival) non-finite bound clauses:
(he said) that he had done the laundry : (she told him) to do the laundry.