Jan 20, 2020
Once you have written a line, you can update your reference(s) up until the slip is signed by the broker:
Instructions
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Select firm order which has the reference(s) you wish to update.
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Select 'Actions' menu (or '≡' on iOS).
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From the drop-down menu, select 'View Written Lines'.
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Select 'Update References' under the stamp.
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Select the stamp you wish to update.
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Update your reference(s).
iOS Tutorial
Browser Tutorial