Hi,
You can realize this by defining your own date determination rule.
SPRO: Sales and Distribution
-> Billing
-> Billing Plan
-> Define Rules For Determining Dates
Here you can try to create your own rule for date determination.
For example, Date det. rule ZZ
Baseline date 07 Billing date/Invoice date
Time period 3 <<<
Time unit 3 Month <<<
Then assign this rule to Billing Plan type that you're using via:
Sales and Distribution
-> Billing
-> Billing Plan
-> Define Billing Plan Types
-> Maintain billing plan types for periodic billing
Field 'Next Bill. Date'.
Hope this helps.
Regards,
Alex