How To Fix /SAPAPO/SDP028 - &: Row [&] is not ready for input (ID:&)

/SAPAPO/SDP028 - Overview

• Message type: E = Error

• Message class: /SAPAPO/SDP -

• Message number: 028

• Message text: &: Row [&] is not ready for input (ID:&)

Self-Explanatory Message

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/SAPAPO/SDP028 - Details

• The SAP error message /SAPAPO/SDP028 &: Row [&] is not ready for input (ID:&) typically occurs in the context of SAP Advanced Planning and Optimization (APO), particularly when working with the Supply Network Planning (SNP) or Demand Planning (DP) modules. This error indicates that a specific row in a planning table is not in a state that allows for input or modification.
  Causes:
  
  Row Status: The row may be in a status that does not allow for input, such as being locked, already processed, or in a read-only state.
  Planning Version: The planning version you are working with may be set to a status that restricts input (e.g., a version that is not editable).
  Data Locking: Another user or process may have locked the data for editing, preventing you from making changes.
  Incorrect Selection: The selection criteria used to access the planning table may not match any editable rows.
  Authorization Issues: The user may not have