This may due to a configuration issue, in your apps/config/filters.yml, it is important to put the soap_parameter before the cache and execution parameters

doesn’t work

# You can find more information about this file on the symfony website:
# http://www.symfony-project.org/reference/1_4/en/12-Filters

rendering: ~
security:  ~

# insert your own filters here

cache:     ~
execution: ~

soap_parameter:
  class: ckSoapParameterFilter
  param:
    condition: %APP_ENABLE_SOAP_PARAMETER%

works

# You can find more information about this file on the symfony website:
# http://www.symfony-project.org/reference/1_4/en/12-Filters

rendering: ~
security:  ~

# insert your own filters here
soap_parameter:
  class: ckSoapParameterFilter
  param:
    condition: %APP_ENABLE_SOAP_PARAMETER%

cache:     ~
execution: ~

It looks weird but it works for me.

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