By standard, on selection of intercompany GL account in advanced intercompany JE, the eliminate checkbox is automatically checked. However, in the case of normal JE, we need to manually check the eliminate checkbox.
In normal JE, we can save the transaction without eliminating for the intercompany current account as the account type is other current asset and not of type A/P or A/R. If the intercompany account is of account type A/P or A/R, we cannot save the journal without checking the eliminate box and selecting To Subsidiary. The intercompany payable/receivable account is of type A/P and A/R. Hence the error was shown during transaction save.