How To Fix /SAPAPO/ATP811 - At least one basic method has caused a date shift

/SAPAPO/ATP811 - Overview

• Message type: E = Error

• Message class: /SAPAPO/ATP -

• Message number: 811

• Message text: At least one basic method has caused a date shift

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/ATP811 - At least one basic method has caused a date shift ?

  The SAP error message /SAPAPO/ATP811 indicates that there is a date shift caused by at least one basic method in the Advanced Planning and Optimization (APO) module, specifically in the context of Available-to-Promise (ATP) checks. This error typically arises during the planning or execution of ATP checks when the system detects that the planned dates for certain operations or activities do not align correctly due to the basic methods defined in the system.
  
  Cause:
  
  Basic Method Configuration: The basic methods used for planning (like heuristic methods, planning strategies, etc.) may not be configured correctly, leading to inconsistencies in date calculations.
  Data Inconsistencies: There may be inconsistencies in master data, such as product master, location master, or resource master, which can affect the planning process.
  Capacity Constraints: If there are capacity constraints on resources, it may lead to shifts in planned dates.
  Lead Times: Incorrect lead times defined in the system can also cause shifts in