Amit,
This question can be best answered by doing tests (by self).
In VOPAN, you give
partner function assigned to account group
SP -- Z001 (account group)
BP - Z001
PY - Z001
In XD01, you create a customer for account group Z001, say the number generated is 55
So, when you go to XD01, Sales area data, Tab partner functions, you will see -
SP 55
BP 55
PY 55
This customer no. will be defaulted for all the partner functions you have assigned to the account group in VOPAN.
As you have not assigned SH to Z001
You will not see entry - SH 55
TW