Add presetValue (and maybe a hidden-tag?) for BT-26

[JanEmde]

There is currently only one valid value in the associated codelist (classification-type.gc) for all BT-26 fields (BT-26(m)-Procedure, BT-26(m)-Lot, BT-26(m)-Part, BT-26(a)-Procedure and BT-26(a)-Lot).

Wouldn't it make sense to preset the field with the value (cpv)? Perhaps it would even make sense to set the field to hidden?

[julemari]

Thank you for your suggestion, we will consider this for SDK 1.14.

[JanEmde]

Thank you!