Once an investment is committed, you are unable to withdraw it. To be fair to SMEs, any withdrawal would disrupt the funding process and delay the funds being disbursed. 

If the financing term has already been disbursed to the issuer, last minute withdrawals may also cause them to delay their growth and expansion plans. Not forgetting the other investors who may have wanted to invest in the same investment opportunity , but missed out because the financing term was fully funded. Do review your financing term selections carefully before confirming an investment.