modifying fields QSL_Rcvd_via or QSL_Sent_via in QSL Managment

[DF2MC]

Little Problem, trying to modifying fields QSL_Rcvd_via or QSL_Sent_via in QSL Managment.
If I made a mistake and would like to replace in this fields the entry E (-E-electronic-)
to empty, going to QSL Management > Update QSO > QSL Information, modifying QSL_Sent_via
(choice empty field) > update or save and exit, -E-electronic- is still there, cannot be changed this way.
All other fields accept to be changed.
Only in QSO Archive > Field update the entry -E- (-E-electronic-) can be deleted.
Is this the only way, to modify this field entries at the QSL-Management ?

[G4POP]

In QSL Management just double left click on the QSO and then select the QSL Information tab

Edit and click save and exit

[IW3HMH]

A value, at least one, is required.
Then, the effective significate of the QSL RCVD is strictly related to the QSL_RCVD_STATUS

Pse note that QSL_RCVD_VIA can have different significates, as a single field doesn't cover all possibilities (qsl + lotw confirmation received, as example)

[DF2MC]

Now I understand the issue, thanks for the fast reply Daniele !
By the way, many thanks for the nice program !
VY73 DF2MC Hans

[DF2MC]

In QSL Management just double left click on the QSO and then select the QSL Information tab

Edit and click save and exit

Thanks Terry,
I have tried to clear a wrong entry (e.g. -E-) in QSL-Information Tab > QSL_Rcvd_via or QSL_Sent_via.
Daniele has explaind, way it is not possible at the QSL-Information TAB.

73 DF2MC Hans