Fitnesse : How to validate rich text field which is header style

Can you please help me how to validate the below message which is in HEADER style .

This information will be recalculated at the time of vanpool delivery to get the most up to date information

SAIL Code:

a!richTextDisplayField(
labelPosition:"COLLAPSED",
value:a!richTextItem(
text:if(
or(
xxxx

xxxx
),
"This information will be recalculated at the time of vanpool delivery to get the most up to date information",
),
style:"HEADER_SMALL"
)

I tried below methods and none are working.

| verify field | [1] | contains validation message | This information will be recalculated at the time of vanpool delivery to get the most up to date information|

   Error : Timeout period reached -Get field value-[1]

|check | get field |[1] |value | This information will be recalculated at the time of vanpool delivery to get the most up to date information |

  Error : Invalid argument: Get field vaue -[1]

| get field | FIELD_LABEL or FIELD_LABEL[INDEX] | in section | SECTION_NAME | value |

| get field | FIELD_LABEL or [FIELD_INDEX] or FIELD_LABEL[INDEX] | validation message |

| verify field | FIELD_LABEL or [FIELD_INDEX] or FIELD_LABEL[INDEX] | contains | VALUES() |