How to Add Groups and PE's with batch Predict

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We have a request to batch update Predict from other systems.

For example, add 2 new fields:
ADD ELEMENT NEWFLD1 DA-DDE-NAME
,1,A,5,AG,N,
ADD ELEMENT NEWFLD1 DA-DDE-NAME
,1,A,7,AH,N,

This works fine for elementary fields, super descriptors and sub descriptors.

However for adding a Group (or a PE Group), it fails:
ADD ELEMENT NEW-GROUP DA-DDE0NAME
,GR,1,GG, ,
ADD ELEMENT GR-MEM1 DA-DDE-NAME
,2,A,5,G1,N,
ADD ELEMENT GR-MEM2 DA-DDE-NAME
,2,A,5,G2,N,

The first ADD statement forces a screen with a select of all level 1 fields.

Any idea how to use batch commands to add Groups or Pe Groups?