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How to force Marketo to accept a *blank* field

Question asked by Sam Taylor on Mar 26, 2019
Latest reply on Mar 26, 2019 by Sanford Whiteman

Hi, I have a very simple Marketo form where someone fills out (amongst other things) their address.

We use Address Line 1, 2 & 3 rather than the 'Address' field.

On the form, Add 1 & 2 are compulsory fields and 3 is not.


In the following example, someone fills out the form, who is already on the database and has changed address


                                 PREVIOUS VALUES                   FILLED IN ON FORM

Address Line 1         1 The High Street                        21 Harbour Road

Address Line 2         Botley                                          Portsmouth

Address Line 3         Southampton                              *this field is left blank*


As Marketo will not overwrite actual data with a blank, how can I make sure that Address Line 3 does not stay "Southampton" and becomes a blank?