First thought-- other accounts are set as Single Mutual Fund accounts. Problem account is not set that way. The SMF accounts know you have to buy that security in that account. A non-SMF accounts cannot know what security you might wants to buy. See edit account details. For the non-SMF account, you will have both shares and cash represented in the account at various times. The presence of those cash values will prevent you from directly changing the account to an SMF account. The change might be possible, but it also might be tedious.