Partially updates deposit_configs.overrides and deposit_configs.interest_capitalization_mode on an active deposit program attachment. Each field follows three‑state PATCH rules, allowing values to be set, changed, or cleared. At the program level, the only supported override inside overrides is renewal_term.

• Omitted: Keeps the current value
• null: Removes the override; falls back through the cascade (product)
• Value: Replaces the current value

NOTES:

• At least one of deposit_configs.overrides or deposit_configs.interest_capitalization_mode must be provided.
• Sending penalties inside overrides returns 400 EIBACC0317
• Sending maturity_instructions inside overrides results in a 400 EIBACC0318 error. This field cannot be modified at the program level and must be configured on each account attachment instead.
• An empty overrides envelope returns 400 EIBACC0315
• renewal_term still requires ROLLOVER configured in maturity_instructions somewhere in the fallback sequence (400 EIBACC0310 otherwise)

This endpoint generates a Program attachment updated event.