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If you take an existing expense type that has cost cards associated with it and flip the TCAF flag on/off, the cards will not be affected unless some type of revalue operation is performed. For example, editing the card, voiding an invoice, etc. If you decide that you want to start using TCAF for an existing expense type, there are two approaches we recommend. First, if there is a strict cutover period you are probably better off making can simply turn TCAF on. This assumes all existing cards will stay as they are and all new cards will have TCAF on. If there is transition period planned where some card might have TCAF on and others OFF, we instead recommend creating a new expense type and deactivating the old one.