Parameterized Oracle Packages

Is there a specific syntax to call oracle package procs with parameters? Ive tried below but nothing seems to work:

KMPROD.PACKAGE_WEB_VALIDATION_PROCS.VALIDATE_ACCTUNIT(:Entity, :Account, :TOC);
exec KMPROD.PACKAGE_WEB_VALIDATION_PROCS.VALIDATE_ACCTUNIT(:Entity, :Account, :TOC);
KMPROD.PACKAGE_WEB_VALIDATION_PROCS.VALIDATE_ACCTUNIT :Entity, :Account, :TOC

Any help is appreciated.