The Mass Copy functionality in the Trade Calendar is a powerful productivity feature that allows Key Account Managers to duplicate successful promotion plans from one year to the next. However, to ensure system performance and stability, Salesforce imposes specific governor limits on this operation.

Duplicating promotions is not a simple record copy; it involves cloning the header, all associated tactics, product splits, and potentially re-calculating initial baseline values for the new dates. If a user were to attempt to copy promotions 5 years into the future in a single action, the calculation load would be immense.

According to the product documentation and best practices for Consumer Goods Cloud TPM, the standard limitation for the Mass Copy window is18 months. This means a user can select a source range and copy it to a target range, provided the target dates do not extend beyond 18 months into the future. This constraint balances usability (allowing for full next-year planning plus a buffer) with the technical constraints of the Processing Service, preventing timeouts and ensuring that the copied data remains manageable and accurate.