Friends,
Suggestions in the sense, creating the possibilty or probabilty of the witness's case doubtful. Though it may be denied by the witness, by adduce rebutting evidence later during his turn( either accused turn in crl cases and defendant's turn in civil cases) , the suggestion may become valid.
Even, suggestion may shift the burden, such suggestion questions will be considered as an attempt to discharge the burden on his shoulder In several appeal matters Judicial views are " the counsel for the accused/defendant /plaintiff not even raised any such question by way suggesion and was silent, shall not permitted in the appeal stage to project a new theory.".
Apart from there are other instances.
For ex; a registered letter and acknowledgement card signed by the addressee.
An office copy of a letter, a postal receipt, and served acknowledgement card -are marked as evidence. In which we may put suggestions as , 'the office copy of the alleged letter was not sent through the RPAD and the served acknowledgment card" meaning that some other letter or blank paper was sent through the RPAD cover.
It is rebuttable evidence . Mere suggestion will not serve any valid purpose. Later , during his turn, if he can able to prove that some other letter was sent through the said RPAD and ack card, the former evidence adduced is became 'not proved' .Even in criminal cases, when other supporting evidences available , the contra story of the defence or probable circumstances as well as the doubt will create by way of suggestions.
It's my little knowledge and observation through my practice .I will take as fair comment even criticism questioning my view.